51605564 has 12 divisors (see below), whose sum is σ = 90360984. Its totient is φ = 25788144.

The previous prime is 51605551. The next prime is 51605641. The reversal of 51605564 is 46550615.

It is a self number, because there is not a number n which added to its sum of digits gives 51605564.

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, 9647 + ... + 14009.

It is an arithmetic number, because the mean of its divisors is an integer number (7530082).

Almost surely, 2^51605564 is an apocalyptic number.

It is an amenable number.

51605564 is a deficient number, since it is larger than the sum of its proper divisors (38755420).

51605564 is a wasteful number, since it uses less digits than its factorization.

51605564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7324 (or 7322 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 51605564 is about 7183.7012744128. The cubic root of 51605564 is about 372.3049778655.

The spelling of 51605564 in words is "fifty-one million, six hundred five thousand, five hundred sixty-four".