668864007 has 32 divisors (see below), whose sum is σ = 1146828800. Its totient is φ = 377361504.

The previous prime is 668863999. The next prime is 668864039. The reversal of 668864007 is 700468866.

It is a happy number.

It is not a de Polignac number, because 668864007 - 2³ = 668863999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668860007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7468 + ... + 37329.

It is an arithmetic number, because the mean of its divisors is an integer number (35838400).

Almost surely, 2^668864007 is an apocalyptic number.

668864007 is a deficient number, since it is larger than the sum of its proper divisors (477964793).

668864007 is a wasteful number, since it uses less digits than its factorization.

668864007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44892 (or 44886 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 668864007 is about 25862.4052825718. The cubic root of 668864007 is about 874.5391889796.

The spelling of 668864007 in words is "six hundred sixty-eight million, eight hundred sixty-four thousand, seven".