51402920 has 32 divisors (see below), whose sum is σ = 115970400. Its totient is φ = 20505408.

The previous prime is 51402881. The next prime is 51402973. The reversal of 51402920 is 2920415.

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, 15227 + ... + 18293.

It is an arithmetic number, because the mean of its divisors is an integer number (3624075).

Almost surely, 2^51402920 is an apocalyptic number.

It is an amenable number.

51402920 is an abundant number, since it is smaller than the sum of its proper divisors (64567480).

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

51402920 is a wasteful number, since it uses less digits than its factorization.

51402920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3497 (or 3493 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 51402920 is about 7169.5829725306. The cubic root of 51402920 is about 371.8170179591.

The spelling of 51402920 in words is "fifty-one million, four hundred two thousand, nine hundred twenty".