128655664 has 20 divisors (see below), whose sum is σ = 249487504. Its totient is φ = 64271808.

The previous prime is 128655661. The next prime is 128655671. The reversal of 128655664 is 466556821.

It is a self number, because there is not a number n which added to its sum of digits gives 128655664.

It is not an unprimeable number, because it can be changed into a prime (128655661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20374 + ... + 25930.

Almost surely, 2^128655664 is an apocalyptic number.

It is an amenable number.

128655664 is a deficient number, since it is larger than the sum of its proper divisors (120831840).

128655664 is a wasteful number, since it uses less digits than its factorization.

128655664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7012 (or 7006 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The square root of 128655664 is about 11342.6480153446. The cubic root of 128655664 is about 504.8274599268.

The spelling of 128655664 in words is "one hundred twenty-eight million, six hundred fifty-five thousand, six hundred sixty-four".