51724690 has 16 divisors (see below), whose sum is σ = 96315480. Its totient is φ = 19976320.

The previous prime is 51724681. The next prime is 51724703. The reversal of 51724690 is 9642715.

It can be written as a sum of positive squares in 4 ways, for example, as 31393609 + 20331081 = 5603^2 + 4509^2 .

It is a super-2 number, since 2×51724690² = 5350887111192200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88891 + ... + 89470.

Almost surely, 2^51724690 is an apocalyptic number.

51724690 is a deficient number, since it is larger than the sum of its proper divisors (44590790).

51724690 is a wasteful number, since it uses less digits than its factorization.

51724690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178397.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 51724690 is about 7191.9879032156. The cubic root of 51724690 is about 372.5912333023.

The spelling of 51724690 in words is "fifty-one million, seven hundred twenty-four thousand, six hundred ninety".