To complement a bit, IEEE754 Float64 are stored as M × 2E, where M is the 53-bit integer mantissa and E the 11-bit exponent (some further details omitted).
700.0 becomes M=700 and E=0, as integer values between and
-2^52 and 2^52-1 are stored with E=0.
0.07 becomes M=6157265115545601 and E=-43, in terms of bits very different from an integer value.
BTW, is there a package for Julia that would reveal mantissa and exponent of IEEE754 floats?