51660624 has 20 divisors (see below), whose sum is σ = 133456736. Its totient is φ = 17220192.

The previous prime is 51660619. The next prime is 51660641. The reversal of 51660624 is 42606615.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 51660591 and 51660600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538084 + ... + 538179.

Almost surely, 2^51660624 is an apocalyptic number.

It is an amenable number.

51660624 is an abundant number, since it is smaller than the sum of its proper divisors (81796112).

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

51660624 is a wasteful number, since it uses less digits than its factorization.

51660624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076274 (or 1076268 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 51660624 is about 7187.5325390568. The cubic root of 51660624 is about 372.4373397297.

It can be divided in two parts, 51 and 660624, that added together give a triangular number (660675 = T₁₁₄₉).

The spelling of 51660624 in words is "fifty-one million, six hundred sixty thousand, six hundred twenty-four".