51535520 has 24 divisors (see below), whose sum is σ = 121753044. Its totient is φ = 20614144.

The previous prime is 51535513. The next prime is 51535537. The reversal of 51535520 is 2553515.

It can be written as a sum of positive squares in 2 ways, for example, as 51208336 + 327184 = 7156^2 + 572^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51535520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160889 + ... + 161208.

Almost surely, 2^51535520 is an apocalyptic number.

It is an amenable number.

51535520 is an abundant number, since it is smaller than the sum of its proper divisors (70217524).

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

51535520 is a wasteful number, since it uses less digits than its factorization.

51535520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322112 (or 322104 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 51535520 is about 7178.8244162955. The cubic root of 51535520 is about 372.1364589749.

The spelling of 51535520 in words is "fifty-one million, five hundred thirty-five thousand, five hundred twenty".