51959520 has 72 divisors (see below), whose sum is σ = 177316776. Its totient is φ = 13855488.

The previous prime is 51959513. The next prime is 51959533. The reversal of 51959520 is 2595915.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16602 + ... + 19481.

It is an arithmetic number, because the mean of its divisors is an integer number (2462733).

Almost surely, 2^51959520 is an apocalyptic number.

It is an amenable number.

51959520 is an abundant number, since it is smaller than the sum of its proper divisors (125357256).

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

51959520 is a wasteful number, since it uses less digits than its factorization.

51959520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36104 (or 36093 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 51959520 is about 7208.2952214792. The cubic root of 51959520 is about 373.1542366593.

The spelling of 51959520 in words is "fifty-one million, nine hundred fifty-nine thousand, five hundred twenty".