51716564 has 6 divisors (see below), whose sum is σ = 90503994. Its totient is φ = 25858280.

The previous prime is 51716543. The next prime is 51716579. The reversal of 51716564 is 46561715.

It can be written as a sum of positive squares in only one way, i.e., 47059600 + 4656964 = 6860^2 + 2158^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 6464567 + ... + 6464574.

It is an arithmetic number, because the mean of its divisors is an integer number (15083999).

Almost surely, 2^51716564 is an apocalyptic number.

It is an amenable number.

51716564 is a deficient number, since it is larger than the sum of its proper divisors (38787430).

51716564 is a wasteful number, since it uses less digits than its factorization.

51716564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12929145 (or 12929143 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 51716564 is about 7191.4229468166. The cubic root of 51716564 is about 372.5717207966.

The spelling of 51716564 in words is "fifty-one million, seven hundred sixteen thousand, five hundred sixty-four".