63908491 has 4 divisors (see below), whose sum is σ = 67667832. Its totient is φ = 60149152.

The previous prime is 63908479. The next prime is 63908503. The reversal of 63908491 is 19480936.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (63908479) and next prime (63908503).

It is a cyclic number.

It is not a de Polignac number, because 63908491 - 2⁵ = 63908459 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63908401) 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, 1879645 + ... + 1879678.

It is an arithmetic number, because the mean of its divisors is an integer number (16916958).

Almost surely, 2^63908491 is an apocalyptic number.

63908491 is a deficient number, since it is larger than the sum of its proper divisors (3759341).

63908491 is a wasteful number, since it uses less digits than its factorization.

63908491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3759340.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 63908491 is about 7994.2786416286. The cubic root of 63908491 is about 399.8092653152.

The spelling of 63908491 in words is "sixty-three million, nine hundred eight thousand, four hundred ninety-one".