128252656 has 40 divisors (see below), whose sum is σ = 291672800. Its totient is φ = 53478144.

The previous prime is 128252653. The next prime is 128252671. The reversal of 128252656 is 656252821.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128252653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11331 + ... + 19618.

It is an arithmetic number, because the mean of its divisors is an integer number (7291820).

Almost surely, 2^128252656 is an apocalyptic number.

128252656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128252656 is an abundant number, since it is smaller than the sum of its proper divisors (163420144).

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

128252656 is a wasteful number, since it uses less digits than its factorization.

128252656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31001 (or 30995 counting only the distinct ones).

The product of its digits is 57600, while the sum is 37.

The square root of 128252656 is about 11324.8689175637. The cubic root of 128252656 is about 504.2997922460.

The spelling of 128252656 in words is "one hundred twenty-eight million, two hundred fifty-two thousand, six hundred fifty-six".