128617972 has 12 divisors (see below), whose sum is σ = 257236000. Its totient is φ = 55121976.

The previous prime is 128617961. The next prime is 128617981. The reversal of 128617972 is 279716821.

128617972 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2296722 + ... + 2296777.

Almost surely, 2^128617972 is an apocalyptic number.

It is an amenable number.

128617972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128617972 is a wasteful number, since it uses less digits than its factorization.

128617972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4593510 (or 4593508 counting only the distinct ones).

The product of its digits is 84672, while the sum is 43.

The square root of 128617972 is about 11340.9863768545. The cubic root of 128617972 is about 504.7781556715.

The spelling of 128617972 in words is "one hundred twenty-eight million, six hundred seventeen thousand, nine hundred seventy-two".