51915880 has 32 divisors (see below), whose sum is σ = 118731240. Its totient is φ = 20424960.

The previous prime is 51915869. The next prime is 51915883. The reversal of 51915880 is 8851915.

It can be written as a sum of positive squares in 4 ways, for example, as 13003236 + 38912644 = 3606^2 + 6238^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51915883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8199 + ... + 13078.

Almost surely, 2^51915880 is an apocalyptic number.

It is an amenable number.

51915880 is an abundant number, since it is smaller than the sum of its proper divisors (66815360).

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

51915880 is a wasteful number, since it uses less digits than its factorization.

51915880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21349 (or 21345 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 37.

The square root of 51915880 is about 7205.2675175874. The cubic root of 51915880 is about 373.0497385677.

The spelling of 51915880 in words is "fifty-one million, nine hundred fifteen thousand, eight hundred eighty".