51812816 has 20 divisors (see below), whose sum is σ = 109513824. Its totient is φ = 23551200.

The previous prime is 51812801. The next prime is 51812819. The reversal of 51812816 is 61821815.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51812819) 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, 147020 + ... + 147371.

Almost surely, 2^51812816 is an apocalyptic number.

It is an amenable number.

51812816 is an abundant number, since it is smaller than the sum of its proper divisors (57701008).

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

51812816 is a wasteful number, since it uses less digits than its factorization.

51812816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294410 (or 294404 counting only the distinct ones).

The product of its digits is 3840, while the sum is 32.

The square root of 51812816 is about 7198.1119746778. Note that the first 3 decimals coincide. The cubic root of 51812816 is about 372.8027141581.

It can be divided in two parts, 5181 and 2816, that added together give a palindrome (7997).

The spelling of 51812816 in words is "fifty-one million, eight hundred twelve thousand, eight hundred sixteen".