51520236 has 12 divisors (see below), whose sum is σ = 120213912. Its totient is φ = 17173408.

The previous prime is 51520219. The next prime is 51520247. The reversal of 51520236 is 63202515.

It is a tau number, because it is divible by the number of its divisors (12).

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, 2146665 + ... + 2146688.

It is an arithmetic number, because the mean of its divisors is an integer number (10017826).

Almost surely, 2^51520236 is an apocalyptic number.

It is an amenable number.

51520236 is an abundant number, since it is smaller than the sum of its proper divisors (68693676).

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

51520236 is a wasteful number, since it uses less digits than its factorization.

51520236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4293360 (or 4293358 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 51520236 is about 7177.7598176590. The cubic root of 51520236 is about 372.0996669009.

The spelling of 51520236 in words is "fifty-one million, five hundred twenty thousand, two hundred thirty-six".