668888798 has 16 divisors (see below), whose sum is σ = 1045764096. Its totient is φ = 320510520.

The previous prime is 668888789. The next prime is 668888833. The reversal of 668888798 is 897888866.

It is a congruent number.

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, 45986 + ... + 58757.

It is an arithmetic number, because the mean of its divisors is an integer number (65360256).

Almost surely, 2^668888798 is an apocalyptic number.

668888798 is a deficient number, since it is larger than the sum of its proper divisors (376875298).

668888798 is a wasteful number, since it uses less digits than its factorization.

668888798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104879.

The product of its digits is 74317824, while the sum is 68.

The square root of 668888798 is about 25862.8845645647. The cubic root of 668888798 is about 874.5499935841.

Adding to 668888798 its sum of digits (68), we get a palindrome (668888866).

The spelling of 668888798 in words is "six hundred sixty-eight million, eight hundred eighty-eight thousand, seven hundred ninety-eight".