634920636 has 36 divisors (see below), whose sum is σ = 1723357608. Its totient is φ = 181405728.

The previous prime is 634920631. The next prime is 634920647. The reversal of 634920636 is 636029436.

It is a junction number, because it is equal to n+sod(n) for n = 634920594 and 634920603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634920631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 539311 + ... + 540486.

Almost surely, 2^634920636 is an apocalyptic number.

It is an amenable number.

634920636 is an abundant number, since it is smaller than the sum of its proper divisors (1088436972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

634920636 is a wasteful number, since it uses less digits than its factorization.

634920636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079818 (or 1079809 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 39.

The square root of 634920636 is about 25197.6315553665. The cubic root of 634920636 is about 859.4879934132.

The spelling of 634920636 in words is "six hundred thirty-four million, nine hundred twenty thousand, six hundred thirty-six".