668958490 has 16 divisors (see below), whose sum is σ = 1204606152. Its totient is φ = 267476544.

The previous prime is 668958469. The next prime is 668958541. The reversal of 668958490 is 94859866.

It can be written as a sum of positive squares in 4 ways, for example, as 617075281 + 51883209 = 24841^2 + 7203^2 .

It is a super-2 number, since 2×668958490² = 895010922686160200, which contains 22 as substring.

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, 16012 + ... + 39928.

Almost surely, 2^668958490 is an apocalyptic number.

668958490 is a deficient number, since it is larger than the sum of its proper divisors (535647662).

668958490 is a wasteful number, since it uses less digits than its factorization.

668958490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26721.

The product of its (nonzero) digits is 3732480, while the sum is 55.

The square root of 668958490 is about 25864.2318656480. The cubic root of 668958490 is about 874.5803658581.

The spelling of 668958490 in words is "six hundred sixty-eight million, nine hundred fifty-eight thousand, four hundred ninety".