63908891 has 8 divisors (see below), whose sum is σ = 64528464. Its totient is φ = 63292320.

The previous prime is 63908869. The next prime is 63908893. The reversal of 63908891 is 19880936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63908891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63908893) 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, 71936 + ... + 72818.

It is an arithmetic number, because the mean of its divisors is an integer number (8066058).

Almost surely, 2^63908891 is an apocalyptic number.

63908891 is a deficient number, since it is larger than the sum of its proper divisors (619573).

63908891 is a wasteful number, since it uses less digits than its factorization.

63908891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 63908891 is about 7994.3036594815. The cubic root of 63908891 is about 399.8100994420.

The spelling of 63908891 in words is "sixty-three million, nine hundred eight thousand, eight hundred ninety-one".