668898 has 20 divisors (see below), whose sum is σ = 1499190. Its totient is φ = 222912.

The previous prime is 668879. The next prime is 668903. The reversal of 668898 is 898866.

668898 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in only one way, i.e., 558009 + 110889 = 747^2 + 333^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1903 + ... + 2226.

2⁶⁶⁸⁸⁹⁸ is an apocalyptic number.

668898 is an abundant number, since it is smaller than the sum of its proper divisors (830292).

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

668898 is a wasteful number, since it uses less digits than its factorization.

668898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143 (or 4134 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 668898 is about 817.8618465242. The cubic root of 668898 is about 87.4554004003.

It can be divided in two parts, 6688 and 98, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 668898 in words is "six hundred sixty-eight thousand, eight hundred ninety-eight".