128656474 has 16 divisors (see below), whose sum is σ = 200598048. Its totient is φ = 61832592.

The previous prime is 128656469. The next prime is 128656481. The reversal of 128656474 is 474656821.

It is a super-2 number, since 2×128656474² = 33104976604225352, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128656474.

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, 4332 + ... + 16615.

It is an arithmetic number, because the mean of its divisors is an integer number (12537378).

Almost surely, 2^128656474 is an apocalyptic number.

128656474 is a deficient number, since it is larger than the sum of its proper divisors (71941574).

128656474 is a wasteful number, since it uses less digits than its factorization.

128656474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21069.

The product of its digits is 322560, while the sum is 43.

The square root of 128656474 is about 11342.6837212363. The cubic root of 128656474 is about 504.8285193681.

The spelling of 128656474 in words is "one hundred twenty-eight million, six hundred fifty-six thousand, four hundred seventy-four".