129628056 has 16 divisors (see below), whose sum is σ = 324070200. Its totient is φ = 43209344.

The previous prime is 129628033. The next prime is 129628087. The reversal of 129628056 is 650826921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2700561 + ... + 2700608.

Almost surely, 2^129628056 is an apocalyptic number.

It is an amenable number.

129628056 is an abundant number, since it is smaller than the sum of its proper divisors (194442144).

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

129628056 is a wasteful number, since it uses less digits than its factorization.

129628056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401178 (or 5401174 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 129628056 is about 11385.4317441193. The cubic root of 129628056 is about 506.0961140568.

The spelling of 129628056 in words is "one hundred twenty-nine million, six hundred twenty-eight thousand, fifty-six".