668989298 has 16 divisors (see below), whose sum is σ = 1008738816. Its totient is φ = 332748000.

The previous prime is 668989291. The next prime is 668989303. The reversal of 668989298 is 892989866.

It is not an unprimeable number, because it can be changed into a prime (668989291) 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, 469415 + ... + 470837.

It is an arithmetic number, because the mean of its divisors is an integer number (63046176).

Almost surely, 2^668989298 is an apocalyptic number.

668989298 is a deficient number, since it is larger than the sum of its proper divisors (339749518).

668989298 is a wasteful number, since it uses less digits than its factorization.

668989298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489.

The product of its digits is 26873856, while the sum is 65.

The square root of 668989298 is about 25864.8274303155. The cubic root of 668989298 is about 874.5937915333.

The spelling of 668989298 in words is "six hundred sixty-eight million, nine hundred eighty-nine thousand, two hundred ninety-eight".