636223972 has 12 divisors (see below), whose sum is σ = 1127486080. Its totient is φ = 314085096.

The previous prime is 636223927. The next prime is 636223979. The reversal of 636223972 is 279322636.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (636223979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006368 + ... + 1006999.

Almost surely, 2^636223972 is an apocalyptic number.

It is an amenable number.

636223972 is a deficient number, since it is larger than the sum of its proper divisors (491262108).

636223972 is a wasteful number, since it uses less digits than its factorization.

636223972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013450 (or 2013448 counting only the distinct ones).

The product of its digits is 163296, while the sum is 40.

The square root of 636223972 is about 25223.4805687082. The cubic root of 636223972 is about 860.0756973211.

The spelling of 636223972 in words is "six hundred thirty-six million, two hundred twenty-three thousand, nine hundred seventy-two".