63531972 has 96 divisors (see below), whose sum is σ = 198195200. Its totient is φ = 17192736.

The previous prime is 63531947. The next prime is 63531983. The reversal of 63531972 is 27913536.

63531972 is a `hidden beast` number, since 635 + 3 + 19 + 7 + 2 = 666.

It is a super-2 number, since 2×63531972² = 8072622932417568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12153 + ... + 16575.

Almost surely, 2^63531972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63531972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99097600).

63531972 is an abundant number, since it is smaller than the sum of its proper divisors (134663228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63531972 is a wasteful number, since it uses less digits than its factorization.

63531972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4462 (or 4454 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 63531972 is about 7970.6945745023. The cubic root of 63531972 is about 399.0225551159.

The spelling of 63531972 in words is "sixty-three million, five hundred thirty-one thousand, nine hundred seventy-two".