63968931 has 24 divisors (see below), whose sum is σ = 101149776. Its totient is φ = 38715840.

The previous prime is 63968923. The next prime is 63968959. The reversal of 63968931 is 13986936.

63968931 is a `hidden beast` number, since 639 + 6 + 8 + 9 + 3 + 1 = 666.

It is not a de Polignac number, because 63968931 - 2³ = 63968923 is a prime.

It is a super-2 number, since 2×63968931² = 8184048266565522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63968431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2656 + ... + 11618.

It is an arithmetic number, because the mean of its divisors is an integer number (4214574).

Almost surely, 2^63968931 is an apocalyptic number.

63968931 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

63968931 is a deficient number, since it is larger than the sum of its proper divisors (37180845).

63968931 is a wasteful number, since it uses less digits than its factorization.

63968931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9043 (or 9040 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 63968931 is about 7998.0579517780. The cubic root of 63968931 is about 399.9352624399.

The spelling of 63968931 in words is "sixty-three million, nine hundred sixty-eight thousand, nine hundred thirty-one".