668772972 has 54 divisors (see below), whose sum is σ = 1966516188. Its totient is φ = 191077488.

The previous prime is 668772953. The next prime is 668772977. The reversal of 668772972 is 279277866.

It is not an unprimeable number, because it can be changed into a prime (668772977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 187798 + ... + 191325.

Almost surely, 2^668772972 is an apocalyptic number.

It is an amenable number.

668772972 is an abundant number, since it is smaller than the sum of its proper divisors (1297743216).

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

668772972 is a wasteful number, since it uses less digits than its factorization.

668772972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379147 (or 379135 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 668772972 is about 25860.6452355698. The cubic root of 668772972 is about 874.4995111146.

The spelling of 668772972 in words is "six hundred sixty-eight million, seven hundred seventy-two thousand, nine hundred seventy-two".