63978651 has 24 divisors (see below), whose sum is σ = 101097984. Its totient is φ = 38666160.

The previous prime is 63978647. The next prime is 63978653. The reversal of 63978651 is 15687936.

It is a happy number.

63978651 is a `hidden beast` number, since 639 + 7 + 8 + 6 + 5 + 1 = 666.

It is not a de Polignac number, because 63978651 - 2² = 63978647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63978597 and 63978606.

It is not an unprimeable number, because it can be changed into a prime (63978653) 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, 47550 + ... + 48876.

It is an arithmetic number, because the mean of its divisors is an integer number (4212416).

Almost surely, 2^63978651 is an apocalyptic number.

63978651 is a deficient number, since it is larger than the sum of its proper divisors (37119333).

63978651 is a wasteful number, since it uses less digits than its factorization.

63978651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1831 (or 1828 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 63978651 is about 7998.6655762071. The cubic root of 63978651 is about 399.9555179702.

The spelling of 63978651 in words is "sixty-three million, nine hundred seventy-eight thousand, six hundred fifty-one".