668590940 has 48 divisors (see below), whose sum is σ = 1472446080. Its totient is φ = 254661120.

The previous prime is 668590939. The next prime is 668590957. The reversal of 668590940 is 49095866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34445 + ... + 50235.

It is an arithmetic number, because the mean of its divisors is an integer number (30675960).

Almost surely, 2^668590940 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 668590940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (736223040).

668590940 is an abundant number, since it is smaller than the sum of its proper divisors (803855140).

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

668590940 is a wasteful number, since it uses less digits than its factorization.

668590940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15902 (or 15900 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 47.

The square root of 668590940 is about 25857.1255169634. The cubic root of 668590940 is about 874.4201611475.

The spelling of 668590940 in words is "six hundred sixty-eight million, five hundred ninety thousand, nine hundred forty".