125639428 has 6 divisors (see below), whose sum is σ = 219869006. Its totient is φ = 62819712.

The previous prime is 125639417. The next prime is 125639447. The reversal of 125639428 is 824936521.

It can be written as a sum of positive squares in only one way, i.e., 125619264 + 20164 = 11208^2 + 142^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15704925 + ... + 15704932.

Almost surely, 2^125639428 is an apocalyptic number.

It is an amenable number.

125639428 is a deficient number, since it is larger than the sum of its proper divisors (94229578).

125639428 is a wasteful number, since it uses less digits than its factorization.

125639428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31409861 (or 31409859 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 125639428 is about 11208.8994999509. The cubic root of 125639428 is about 500.8511210306.

The spelling of 125639428 in words is "one hundred twenty-five million, six hundred thirty-nine thousand, four hundred twenty-eight".