129428875 has 32 divisors (see below), whose sum is σ = 168689664. Its totient is φ = 99036000.

The previous prime is 129428863. The next prime is 129428899. The reversal of 129428875 is 578824921.

It is not a de Polignac number, because 129428875 - 2¹⁵ = 129396107 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 491994 + ... + 492256.

It is an arithmetic number, because the mean of its divisors is an integer number (5271552).

Almost surely, 2^129428875 is an apocalyptic number.

129428875 is a deficient number, since it is larger than the sum of its proper divisors (39260789).

129428875 is a wasteful number, since it uses less digits than its factorization.

129428875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 426 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 129428875 is about 11376.6811944433. The cubic root of 129428875 is about 505.8367658671.

The spelling of 129428875 in words is "one hundred twenty-nine million, four hundred twenty-eight thousand, eight hundred seventy-five".