636672937 has 2 divisors, whose sum is σ = 636672938. Its totient is φ = 636672936.

The previous prime is 636672917. The next prime is 636672961. The reversal of 636672937 is 739276636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635846656 + 826281 = 25216^2 + 909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636672937 is a prime.

It is not a weakly prime, because it can be changed into another prime (636672917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318336468 + 318336469.

It is an arithmetic number, because the mean of its divisors is an integer number (318336469).

Almost surely, 2^636672937 is an apocalyptic number.

It is an amenable number.

636672937 is a deficient number, since it is larger than the sum of its proper divisors (1).

636672937 is an equidigital number, since it uses as much as digits as its factorization.

636672937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 49.

The square root of 636672937 is about 25232.3787424016. The cubic root of 636672937 is about 860.2779599978.

The spelling of 636672937 in words is "six hundred thirty-six million, six hundred seventy-two thousand, nine hundred thirty-seven".