668598 has 16 divisors (see below), whose sum is σ = 1528320. Its totient is φ = 191016.

The previous prime is 668581. The next prime is 668599. The reversal of 668598 is 895866.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 15919 = 668598 / (6 + 6 + 8 + 5 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7918 + ... + 8001.

It is an arithmetic number, because the mean of its divisors is an integer number (95520).

2⁶⁶⁸⁵⁹⁸ is an apocalyptic number.

668598 is an abundant number, since it is smaller than the sum of its proper divisors (859722).

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

668598 is a wasteful number, since it uses less digits than its factorization.

668598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15931.

The product of its digits is 103680, while the sum is 42.

The square root of 668598 is about 817.6784208966. The cubic root of 668598 is about 87.4423238956.

The spelling of 668598 in words is "six hundred sixty-eight thousand, five hundred ninety-eight".