128111656 has 32 divisors (see below), whose sum is σ = 254923200. Its totient is φ = 60227200.

The previous prime is 128111639. The next prime is 128111689. The reversal of 128111656 is 656111821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4956 + ... + 16756.

It is an arithmetic number, because the mean of its divisors is an integer number (7966350).

Almost surely, 2^128111656 is an apocalyptic number.

It is an amenable number.

128111656 is a deficient number, since it is larger than the sum of its proper divisors (126811544).

128111656 is a wasteful number, since it uses less digits than its factorization.

128111656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11889 (or 11885 counting only the distinct ones).

The product of its digits is 2880, while the sum is 31.

The square root of 128111656 is about 11318.6419680101. The cubic root of 128111656 is about 504.1149166867.

The spelling of 128111656 in words is "one hundred twenty-eight million, one hundred eleven thousand, six hundred fifty-six".