636740667 has 6 divisors (see below), whose sum is σ = 919736532. Its totient is φ = 424493772.

The previous prime is 636740641. The next prime is 636740707. The reversal of 636740667 is 766047636.

636740667 is a `hidden beast` number, since 636 + 7 + 4 + 0 + 6 + 6 + 7 = 666.

It is not a de Polignac number, because 636740667 - 2⁷ = 636740539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (636740267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35374473 + ... + 35374490.

It is an arithmetic number, because the mean of its divisors is an integer number (153289422).

Almost surely, 2^636740667 is an apocalyptic number.

636740667 is a deficient number, since it is larger than the sum of its proper divisors (282995865).

636740667 is a wasteful number, since it uses less digits than its factorization.

636740667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70748969 (or 70748966 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The square root of 636740667 is about 25233.7208314588. The cubic root of 636740667 is about 860.3084647027.

The spelling of 636740667 in words is "six hundred thirty-six million, seven hundred forty thousand, six hundred sixty-seven".