668001408 has 32 divisors (see below), whose sum is σ = 1774379760. Its totient is φ = 222667008.

The previous prime is 668001401. The next prime is 668001437. The reversal of 668001408 is 804100866.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (668001401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869410 + ... + 870177.

Almost surely, 2^668001408 is an apocalyptic number.

It is an amenable number.

668001408 is an abundant number, since it is smaller than the sum of its proper divisors (1106378352).

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

668001408 is a wasteful number, since it uses less digits than its factorization.

668001408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739604 (or 1739592 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 668001408 is about 25845.7232052036. The cubic root of 668001408 is about 874.1630780672.

The spelling of 668001408 in words is "six hundred sixty-eight million, one thousand, four hundred eight".