51517872 has 60 divisors (see below), whose sum is σ = 164778640. Its totient is φ = 14719104.

The previous prime is 51517867. The next prime is 51517883. The reversal of 51517872 is 27871515.

51517872 is a `hidden beast` number, since 515 + 1 + 78 + 72 = 666.

It is a super-2 number, since 2×51517872² = 5308182270816768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24547 + ... + 26562.

Almost surely, 2^51517872 is an apocalyptic number.

It is an amenable number.

51517872 is an abundant number, since it is smaller than the sum of its proper divisors (113260768).

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

51517872 is a wasteful number, since it uses less digits than its factorization.

51517872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51130 (or 51121 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 51517872 is about 7177.5951404353. The cubic root of 51517872 is about 372.0939755639.

The spelling of 51517872 in words is "fifty-one million, five hundred seventeen thousand, eight hundred seventy-two".