128836872 has 64 divisors (see below), whose sum is σ = 376728000. Its totient is φ = 40684032.

The previous prime is 128836871. The next prime is 128836907. The reversal of 128836872 is 278638821.

128836872 is a `hidden beast` number, since 1 + 288 + 368 + 7 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (128836871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11593 + ... + 19800.

It is an arithmetic number, because the mean of its divisors is an integer number (5886375).

Almost surely, 2^128836872 is an apocalyptic number.

128836872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128836872 is an abundant number, since it is smaller than the sum of its proper divisors (247891128).

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

128836872 is a wasteful number, since it uses less digits than its factorization.

128836872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31427 (or 31417 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 128836872 is about 11350.6331100957. The cubic root of 128836872 is about 505.0643606498.

The spelling of 128836872 in words is "one hundred twenty-eight million, eight hundred thirty-six thousand, eight hundred seventy-two".