51931860 has 48 divisors (see below), whose sum is σ = 146924736. Its totient is φ = 13704192.

The previous prime is 51931843. The next prime is 51931903. The reversal of 51931860 is 6813915.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1359 + ... + 10281.

It is an arithmetic number, because the mean of its divisors is an integer number (3060932).

Almost surely, 2^51931860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51931860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73462368).

51931860 is an abundant number, since it is smaller than the sum of its proper divisors (94992876).

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

51931860 is a wasteful number, since it uses less digits than its factorization.

51931860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9032 (or 9030 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 51931860 is about 7206.3763432116. The cubic root of 51931860 is about 373.0880102441.

The spelling of 51931860 in words is "fifty-one million, nine hundred thirty-one thousand, eight hundred sixty".