128725836 has 48 divisors (see below), whose sum is σ = 334776960. Its totient is φ = 38257920.

The previous prime is 128725829. The next prime is 128725837. The reversal of 128725836 is 638527821.

It is not an unprimeable number, because it can be changed into a prime (128725837) 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, 12730 + ... + 20481.

It is an arithmetic number, because the mean of its divisors is an integer number (6974520).

Almost surely, 2^128725836 is an apocalyptic number.

It is an amenable number.

128725836 is an abundant number, since it is smaller than the sum of its proper divisors (206051124).

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

128725836 is a wasteful number, since it uses less digits than its factorization.

128725836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33254 (or 33252 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 128725836 is about 11345.7408748834. The cubic root of 128725836 is about 504.9192250639.

The spelling of 128725836 in words is "one hundred twenty-eight million, seven hundred twenty-five thousand, eight hundred thirty-six".