51814720 has 28 divisors (see below), whose sum is σ = 123384564. Its totient is φ = 20725760.

The previous prime is 51814703. The next prime is 51814723. The reversal of 51814720 is 2741815.

It can be written as a sum of positive squares in 2 ways, for example, as 5683456 + 46131264 = 2384^2 + 6792^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51814723) 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, 80641 + ... + 81280.

Almost surely, 2^51814720 is an apocalyptic number.

It is an amenable number.

51814720 is an abundant number, since it is smaller than the sum of its proper divisors (71569844).

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

51814720 is a wasteful number, since it uses less digits than its factorization.

51814720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161938 (or 161928 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51814720 is about 7198.2442303662. The cubic root of 51814720 is about 372.8072806452.

The spelling of 51814720 in words is "fifty-one million, eight hundred fourteen thousand, seven hundred twenty".