634949636 has 12 divisors (see below), whose sum is σ = 1114192128. Its totient is φ = 316609032.

The previous prime is 634949611. The next prime is 634949639. The reversal of 634949636 is 636949436.

It is a happy number.

It is a super-2 number, since 2×634949636² = 806322080513064992, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (634949639) 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, 214796 + ... + 217731.

It is an arithmetic number, because the mean of its divisors is an integer number (92849344).

Almost surely, 2^634949636 is an apocalyptic number.

It is an amenable number.

634949636 is a deficient number, since it is larger than the sum of its proper divisors (479242492).

634949636 is a wasteful number, since it uses less digits than its factorization.

634949636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432898 (or 432896 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 50.

The square root of 634949636 is about 25198.2069997054. The cubic root of 634949636 is about 859.5010789187.

The spelling of 634949636 in words is "six hundred thirty-four million, nine hundred forty-nine thousand, six hundred thirty-six".