51535720 has 16 divisors (see below), whose sum is σ = 115955460. Its totient is φ = 20614272.

The previous prime is 51535703. The next prime is 51535739. The reversal of 51535720 is 2753515.

51535720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 45454564 + 6081156 = 6742^2 + 2466^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644157 + ... + 644236.

Almost surely, 2^51535720 is an apocalyptic number.

It is an amenable number.

51535720 is an abundant number, since it is smaller than the sum of its proper divisors (64419740).

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

51535720 is a wasteful number, since it uses less digits than its factorization.

51535720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288404 (or 1288400 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 51535720 is about 7178.8383461393. The cubic root of 51535720 is about 372.1369403723.

The spelling of 51535720 in words is "fifty-one million, five hundred thirty-five thousand, seven hundred twenty".