63972206728 has 16 divisors (see below), whose sum is σ = 127003645980. Its totient is φ = 30104567808.

The previous prime is 63972206659. The next prime is 63972206741. The reversal of 63972206728 is 82760227936.

It can be written as a sum of positive squares in 2 ways, for example, as 49692434724 + 14279772004 = 222918^2 + 119498^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 235191801 + ... + 235192072.

Almost surely, 2^63972206728 is an apocalyptic number.

63972206728 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

63972206728 is a deficient number, since it is larger than the sum of its proper divisors (63031439252).

63972206728 is a wasteful number, since it uses less digits than its factorization.

63972206728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470383896 (or 470383892 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 52.

The spelling of 63972206728 in words is "sixty-three billion, nine hundred seventy-two million, two hundred six thousand, seven hundred twenty-eight".