636760667 has 4 divisors (see below), whose sum is σ = 639616320. Its totient is φ = 633905016.

The previous prime is 636760643. The next prime is 636760679. The reversal of 636760667 is 766067636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 636760667 - 2²⁴ = 619983451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636760067) 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, 1427492 + ... + 1427937.

It is an arithmetic number, because the mean of its divisors is an integer number (159904080).

Almost surely, 2^636760667 is an apocalyptic number.

636760667 is a deficient number, since it is larger than the sum of its proper divisors (2855653).

636760667 is a wasteful number, since it uses less digits than its factorization.

636760667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855652.

The product of its (nonzero) digits is 1143072, while the sum is 47.

The square root of 636760667 is about 25234.1171234501. The cubic root of 636760667 is about 860.3174720271.

The spelling of 636760667 in words is "six hundred thirty-six million, seven hundred sixty thousand, six hundred sixty-seven".