636699464 has 16 divisors (see below), whose sum is σ = 1206120300. Its totient is φ = 315067392.

The previous prime is 636699461. The next prime is 636699467. The reversal of 636699464 is 464996636.

It is an interprime number because it is at equal distance from previous prime (636699461) and next prime (636699467).

It can be written as a sum of positive squares in 2 ways, for example, as 578787364 + 57912100 = 24058^2 + 7610^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (636699461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 409469 + ... + 411020.

Almost surely, 2^636699464 is an apocalyptic number.

It is an amenable number.

636699464 is a deficient number, since it is larger than the sum of its proper divisors (569420836).

636699464 is a wasteful number, since it uses less digits than its factorization.

636699464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820592 (or 820588 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 53.

The square root of 636699464 is about 25232.9043908940. The cubic root of 636699464 is about 860.2899076689.

The spelling of 636699464 in words is "six hundred thirty-six million, six hundred ninety-nine thousand, four hundred sixty-four".