63908631 has 6 divisors (see below), whose sum is σ = 92312480. Its totient is φ = 42605748.

The previous prime is 63908587. The next prime is 63908641. The reversal of 63908631 is 13680936.

It is a happy number.

It is not a de Polignac number, because 63908631 - 2⁶ = 63908567 is a prime.

It is a super-2 number, since 2×63908631² = 8168626232588322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63908641) 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, 3550471 + ... + 3550488.

Almost surely, 2^63908631 is an apocalyptic number.

63908631 is a deficient number, since it is larger than the sum of its proper divisors (28403849).

63908631 is a wasteful number, since it uses less digits than its factorization.

63908631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7100965 (or 7100962 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 63908631 is about 7994.2873978861. The cubic root of 63908631 is about 399.8095572600.

The spelling of 63908631 in words is "sixty-three million, nine hundred eight thousand, six hundred thirty-one".