51728715 has 12 divisors (see below), whose sum is σ = 89663184. Its totient is φ = 27588624.

The previous prime is 51728639. The next prime is 51728731. The reversal of 51728715 is 51782715.

It is not a de Polignac number, because 51728715 - 2⁸ = 51728459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51728715.

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, 574719 + ... + 574808.

It is an arithmetic number, because the mean of its divisors is an integer number (7471932).

Almost surely, 2^51728715 is an apocalyptic number.

51728715 is a deficient number, since it is larger than the sum of its proper divisors (37934469).

51728715 is a wasteful number, since it uses less digits than its factorization.

51728715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149538 (or 1149535 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 51728715 is about 7192.2677230481. The cubic root of 51728715 is about 372.6008975511.

The spelling of 51728715 in words is "fifty-one million, seven hundred twenty-eight thousand, seven hundred fifteen".