668969644 has 24 divisors (see below), whose sum is σ = 1342928160. Its totient is φ = 285632256.

The previous prime is 668969627. The next prime is 668969647. The reversal of 668969644 is 446969866.

It is a hoax number, since the sum of its digits (58) 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 (668969647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36877 + ... + 51940.

It is an arithmetic number, because the mean of its divisors is an integer number (55955340).

Almost surely, 2^668969644 is an apocalyptic number.

It is an amenable number.

668969644 is an abundant number, since it is smaller than the sum of its proper divisors (673958516).

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

668969644 is a wasteful number, since it uses less digits than its factorization.

668969644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89097 (or 89095 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 58.

The square root of 668969644 is about 25864.4474907159. The cubic root of 668969644 is about 874.5852266555.

The spelling of 668969644 in words is "six hundred sixty-eight million, nine hundred sixty-nine thousand, six hundred forty-four".