63815972 has 24 divisors (see below), whose sum is σ = 125126400. Its totient is φ = 28222560.

The previous prime is 63815971. The next prime is 63815981. The reversal of 63815972 is 27951836.

It is not an unprimeable number, because it can be changed into a prime (63815971) 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, 17972 + ... + 21227.

It is an arithmetic number, because the mean of its divisors is an integer number (5213600).

Almost surely, 2^63815972 is an apocalyptic number.

It is an amenable number.

63815972 is a deficient number, since it is larger than the sum of its proper divisors (61310428).

63815972 is a wasteful number, since it uses less digits than its factorization.

63815972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39251 (or 39249 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 63815972 is about 7988.4899699505. The cubic root of 63815972 is about 399.6162402723.

The spelling of 63815972 in words is "sixty-three million, eight hundred fifteen thousand, nine hundred seventy-two".