128651256 has 48 divisors (see below), whose sum is σ = 353644200. Its totient is φ = 42242112.

The previous prime is 128651249. The next prime is 128651309. The reversal of 128651256 is 652156821.

128651256 is a `hidden beast` number, since 12 + 86 + 512 + 56 = 666.

It is a super-2 number, since 2×128651256² = 33102291340755072, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 128651256.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8511 + ... + 18158.

Almost surely, 2^128651256 is an apocalyptic number.

It is an amenable number.

128651256 is an abundant number, since it is smaller than the sum of its proper divisors (224992944).

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

128651256 is a wasteful number, since it uses less digits than its factorization.

128651256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26748 (or 26741 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 128651256 is about 11342.4537027929. The cubic root of 128651256 is about 504.8216943952.

The spelling of 128651256 in words is "one hundred twenty-eight million, six hundred fifty-one thousand, two hundred fifty-six".