51536644 has 6 divisors (see below), whose sum is σ = 90189134. Its totient is φ = 25768320.

The previous prime is 51536623. The next prime is 51536659. The reversal of 51536644 is 44663515.

It can be written as a sum of positive squares in only one way, i.e., 32718400 + 18818244 = 5720^2 + 4338^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6442077 + ... + 6442084.

Almost surely, 2^51536644 is an apocalyptic number.

It is an amenable number.

51536644 is a deficient number, since it is larger than the sum of its proper divisors (38652490).

51536644 is a wasteful number, since it uses less digits than its factorization.

51536644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12884165 (or 12884163 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 51536644 is about 7178.9027016669. The cubic root of 51536644 is about 372.1391644121.

The spelling of 51536644 in words is "fifty-one million, five hundred thirty-six thousand, six hundred forty-four".