51858920 has 16 divisors (see below), whose sum is σ = 116682660. Its totient is φ = 20743552.

The previous prime is 51858913. The next prime is 51858943. The reversal of 51858920 is 2985815.

It can be written as a sum of positive squares in 2 ways, for example, as 50608996 + 1249924 = 7114^2 + 1118^2 .

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, 648197 + ... + 648276.

Almost surely, 2^51858920 is an apocalyptic number.

It is an amenable number.

51858920 is an abundant number, since it is smaller than the sum of its proper divisors (64823740).

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

51858920 is a wasteful number, since it uses less digits than its factorization.

51858920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296484 (or 1296480 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 51858920 is about 7201.3137690285. The cubic root of 51858920 is about 372.9132569555.

The spelling of 51858920 in words is "fifty-one million, eight hundred fifty-eight thousand, nine hundred twenty".