668588490 has 24 divisors (see below), whose sum is σ = 1738330308. Its totient is φ = 178290240.

The previous prime is 668588423. The next prime is 668588491. The reversal of 668588490 is 94885866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 609744249 + 58844241 = 24693^2 + 7671^2 .

It is not an unprimeable number, because it can be changed into a prime (668588491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3714291 + ... + 3714470.

Almost surely, 2^668588490 is an apocalyptic number.

668588490 is an abundant number, since it is smaller than the sum of its proper divisors (1069741818).

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

668588490 is a wasteful number, since it uses less digits than its factorization.

668588490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7428774 (or 7428771 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The square root of 668588490 is about 25857.0781411976. The cubic root of 668588490 is about 874.4190930644.

The spelling of 668588490 in words is "six hundred sixty-eight million, five hundred eighty-eight thousand, four hundred ninety".