51500840 has 32 divisors (see below), whose sum is σ = 116328960. Its totient is φ = 20520000.

The previous prime is 51500783. The next prime is 51500863. The reversal of 51500840 is 4800515.

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, 8465 + ... + 13215.

It is an arithmetic number, because the mean of its divisors is an integer number (3635280).

Almost surely, 2^51500840 is an apocalyptic number.

It is an amenable number.

51500840 is an abundant number, since it is smaller than the sum of its proper divisors (64828120).

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

51500840 is a wasteful number, since it uses less digits than its factorization.

51500840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5033 (or 5029 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 51500840 is about 7176.4085725382. The cubic root of 51500840 is about 372.0529658271.

The spelling of 51500840 in words is "fifty-one million, five hundred thousand, eight hundred forty".