51715720 has 64 divisors (see below), whose sum is σ = 139996800. Its totient is φ = 16796160.

The previous prime is 51715709. The next prime is 51715747. The reversal of 51715720 is 2751715.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 15 ways as a sum of consecutive naturals, for example, 460 + ... + 10180.

It is an arithmetic number, because the mean of its divisors is an integer number (2187450).

Almost surely, 2^51715720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51715720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69998400).

51715720 is an abundant number, since it is smaller than the sum of its proper divisors (88281080).

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

51715720 is a wasteful number, since it uses less digits than its factorization.

51715720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9758 (or 9754 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 51715720 is about 7191.3642655619. The cubic root of 51715720 is about 372.5696940298.

The spelling of 51715720 in words is "fifty-one million, seven hundred fifteen thousand, seven hundred twenty".