128920774 has 16 divisors (see below), whose sum is σ = 197956512. Its totient is φ = 62952768.

The previous prime is 128920763. The next prime is 128920783. The reversal of 128920774 is 477029821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10752 + ... + 19324.

It is an arithmetic number, because the mean of its divisors is an integer number (12372282).

Almost surely, 2^128920774 is an apocalyptic number.

128920774 is a deficient number, since it is larger than the sum of its proper divisors (69035738).

128920774 is a wasteful number, since it uses less digits than its factorization.

128920774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 128920774 is about 11354.3284257591. The cubic root of 128920774 is about 505.1739739768.

The spelling of 128920774 in words is "one hundred twenty-eight million, nine hundred twenty thousand, seven hundred seventy-four".