51511872 has 28 divisors (see below), whose sum is σ = 136292336. Its totient is φ = 17170560.

The previous prime is 51511861. The next prime is 51511879. The reversal of 51511872 is 27811515.

It is not an unprimeable number, because it can be changed into a prime (51511879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133954 + ... + 134337.

Almost surely, 2^51511872 is an apocalyptic number.

It is an amenable number.

51511872 is an abundant number, since it is smaller than the sum of its proper divisors (84780464).

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

51511872 is a wasteful number, since it uses less digits than its factorization.

51511872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268306 (or 268296 counting only the distinct ones).

The product of its digits is 2800, while the sum is 30.

The square root of 51511872 is about 7177.1771609735. The cubic root of 51511872 is about 372.0795297646.

The spelling of 51511872 in words is "fifty-one million, five hundred eleven thousand, eight hundred seventy-two".