51990862 has 48 divisors (see below), whose sum is σ = 104824368. Its totient is φ = 19057920.

The previous prime is 51990857. The next prime is 51990877. The reversal of 51990862 is 26809915.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16908 + ... + 19744.

It is an arithmetic number, because the mean of its divisors is an integer number (2183841).

Almost surely, 2^51990862 is an apocalyptic number.

51990862 is an abundant number, since it is smaller than the sum of its proper divisors (52833506).

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

51990862 is a wasteful number, since it uses less digits than its factorization.

51990862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881 (or 2874 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 51990862 is about 7210.4689167904. The cubic root of 51990862 is about 373.2292504990.

The spelling of 51990862 in words is "fifty-one million, nine hundred ninety thousand, eight hundred sixty-two".