668239368 has 32 divisors (see below), whose sum is σ = 1671408000. Its totient is φ = 222638528.

The previous prime is 668239357. The next prime is 668239387. The reversal of 668239368 is 863932866.

It is a self number, because there is not a number n which added to its sum of digits gives 668239368.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55558 + ... + 66506.

It is an arithmetic number, because the mean of its divisors is an integer number (52231500).

Almost surely, 2^668239368 is an apocalyptic number.

It is an amenable number.

668239368 is an abundant number, since it is smaller than the sum of its proper divisors (1003168632).

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

668239368 is a wasteful number, since it uses less digits than its factorization.

668239368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13501 (or 13497 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 51.

The square root of 668239368 is about 25850.3262648656. The cubic root of 668239368 is about 874.2668658478.

The spelling of 668239368 in words is "six hundred sixty-eight million, two hundred thirty-nine thousand, three hundred sixty-eight".