634646636 has 24 divisors (see below), whose sum is σ = 1248069984. Its totient is φ = 280177920.

The previous prime is 634646633. The next prime is 634646641. The reversal of 634646636 is 636646436.

It is a happy number.

It is a super-2 number, since 2×634646636² = 805552705172232992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (634646633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264125 + ... + 266516.

It is an arithmetic number, because the mean of its divisors is an integer number (52002916).

Almost surely, 2^634646636 is an apocalyptic number.

It is an amenable number.

634646636 is a deficient number, since it is larger than the sum of its proper divisors (613423348).

634646636 is a wasteful number, since it uses less digits than its factorization.

634646636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530681 (or 530679 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 44.

The square root of 634646636 is about 25192.1939497139. The cubic root of 634646636 is about 859.3643382761.

The spelling of 634646636 in words is "six hundred thirty-four million, six hundred forty-six thousand, six hundred thirty-six".