668786824 has 64 divisors (see below), whose sum is σ = 1338624000. Its totient is φ = 312586560.

The previous prime is 668786821. The next prime is 668786827. The reversal of 668786824 is 428687866.

It is an interprime number because it is at equal distance from previous prime (668786821) and next prime (668786827).

It is not an unprimeable number, because it can be changed into a prime (668786821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2020339 + ... + 2020669.

It is an arithmetic number, because the mean of its divisors is an integer number (20916000).

Almost surely, 2^668786824 is an apocalyptic number.

It is an amenable number.

668786824 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

668786824 is a wasteful number, since it uses less digits than its factorization.

668786824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 574 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 55.

The square root of 668786824 is about 25860.9130542601. The cubic root of 668786824 is about 874.5055487807.

The spelling of 668786824 in words is "six hundred sixty-eight million, seven hundred eighty-six thousand, eight hundred twenty-four".