129085928 has 16 divisors (see below), whose sum is σ = 242213760. Its totient is φ = 64495600.

The previous prime is 129085909. The next prime is 129085949. The reversal of 129085928 is 829580921.

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, 7433 + ... + 17703.

It is an arithmetic number, because the mean of its divisors is an integer number (15138360).

Almost surely, 2^129085928 is an apocalyptic number.

It is an amenable number.

129085928 is a deficient number, since it is larger than the sum of its proper divisors (113127832).

129085928 is a wasteful number, since it uses less digits than its factorization.

129085928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11848 (or 11844 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 129085928 is about 11361.5988311505. The cubic root of 129085928 is about 505.3895996891.

The spelling of 129085928 in words is "one hundred twenty-nine million, eighty-five thousand, nine hundred twenty-eight".