668889250 has 16 divisors (see below), whose sum is σ = 1252161144. Its totient is φ = 267555600.

The previous prime is 668889229. The next prime is 668889251. The reversal of 668889250 is 52988866.

It can be written as a sum of positive squares in 4 ways, for example, as 138462289 + 530426961 = 11767^2 + 23031^2 .

It is not an unprimeable number, because it can be changed into a prime (668889251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1337529 + ... + 1338028.

Almost surely, 2^668889250 is an apocalyptic number.

668889250 is a deficient number, since it is larger than the sum of its proper divisors (583271894).

668889250 is a wasteful number, since it uses less digits than its factorization.

668889250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675574 (or 2675564 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The square root of 668889250 is about 25862.8933029543. The cubic root of 668889250 is about 874.5501905757.

The spelling of 668889250 in words is "six hundred sixty-eight million, eight hundred eighty-nine thousand, two hundred fifty".