51532720 has 20 divisors (see below), whose sum is σ = 119813760. Its totient is φ = 20613056.

The previous prime is 51532717. The next prime is 51532781. The reversal of 51532720 is 2723515.

It is a tau number, because it is divible by the number of its divisors (20).

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, 322000 + ... + 322159.

It is an arithmetic number, because the mean of its divisors is an integer number (5990688).

Almost surely, 2^51532720 is an apocalyptic number.

It is an amenable number.

51532720 is an abundant number, since it is smaller than the sum of its proper divisors (68281040).

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

51532720 is a wasteful number, since it uses less digits than its factorization.

51532720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644172 (or 644166 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 51532720 is about 7178.6293956437. The cubic root of 51532720 is about 372.1297192806.

The spelling of 51532720 in words is "fifty-one million, five hundred thirty-two thousand, seven hundred twenty".