51909872 has 40 divisors (see below), whose sum is σ = 118659072. Its totient is φ = 21528000.

The previous prime is 51909863. The next prime is 51909877. The reversal of 51909872 is 27890915.

It is a super-2 number, since 2×51909872² = 5389269622112768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51909877) 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, 4004 + ... + 10947.

Almost surely, 2^51909872 is an apocalyptic number.

It is an amenable number.

51909872 is an abundant number, since it is smaller than the sum of its proper divisors (66749200).

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

51909872 is a wasteful number, since it uses less digits than its factorization.

51909872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14997 (or 14991 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 51909872 is about 7204.8505883190. The cubic root of 51909872 is about 373.0353475356.

The spelling of 51909872 in words is "fifty-one million, nine hundred nine thousand, eight hundred seventy-two".