51864628 has 6 divisors (see below), whose sum is σ = 90763106. Its totient is φ = 25932312.

The previous prime is 51864619. The next prime is 51864629. The reversal of 51864628 is 82646815.

It can be written as a sum of positive squares in only one way, i.e., 50523664 + 1340964 = 7108^2 + 1158^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51864629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6483075 + ... + 6483082.

Almost surely, 2^51864628 is an apocalyptic number.

It is an amenable number.

51864628 is a deficient number, since it is larger than the sum of its proper divisors (38898478).

51864628 is a wasteful number, since it uses less digits than its factorization.

51864628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12966161 (or 12966159 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 51864628 is about 7201.7100746975. The cubic root of 51864628 is about 372.9269383741.

The spelling of 51864628 in words is "fifty-one million, eight hundred sixty-four thousand, six hundred twenty-eight".