668501376 has 64 divisors (see below), whose sum is σ = 1784922480. Its totient is φ = 221677568.

The previous prime is 668501363. The next prime is 668501381. The reversal of 668501376 is 673105866.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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, 71230 + ... + 80066.

Almost surely, 2^668501376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668501376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892461240).

668501376 is an abundant number, since it is smaller than the sum of its proper divisors (1116421104).

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

668501376 is a wasteful number, since it uses less digits than its factorization.

668501376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9051 (or 9039 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 668501376 is about 25855.3935572445. The cubic root of 668501376 is about 874.3811138217.

The spelling of 668501376 in words is "six hundred sixty-eight million, five hundred one thousand, three hundred seventy-six".