636164768 has 12 divisors (see below), whose sum is σ = 1252449450. Its totient is φ = 318082368.

The previous prime is 636164759. The next prime is 636164807. The reversal of 636164768 is 867461636.

It can be written as a sum of positive squares in only one way, i.e., 344028304 + 292136464 = 18548^2 + 17092^2 .

It is a super-2 number, since 2×636164768² = 809411224088987648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940043 + ... + 9940106.

Almost surely, 2^636164768 is an apocalyptic number.

It is an amenable number.

636164768 is a deficient number, since it is larger than the sum of its proper divisors (616284682).

636164768 is a wasteful number, since it uses less digits than its factorization.

636164768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19880159 (or 19880151 counting only the distinct ones).

The product of its digits is 870912, while the sum is 47.

The square root of 636164768 is about 25222.3069523785. The cubic root of 636164768 is about 860.0490182985.

The spelling of 636164768 in words is "six hundred thirty-six million, one hundred sixty-four thousand, seven hundred sixty-eight".