668790 has 32 divisors (see below), whose sum is σ = 1784160. Its totient is φ = 178272.

The previous prime is 668761. The next prime is 668791. The reversal of 668790 is 97866.

668790 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 969 + ... + 1508.

It is an arithmetic number, because the mean of its divisors is an integer number (55755).

2⁶⁶⁸⁷⁹⁰ is an apocalyptic number.

668790 is an abundant number, since it is smaller than the sum of its proper divisors (1115370).

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

668790 is a wasteful number, since it uses less digits than its factorization.

668790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493 (or 2487 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 668790 is about 817.7958180377. The cubic root of 668790 is about 87.4506933091.

The spelling of 668790 in words is "six hundred sixty-eight thousand, seven hundred ninety".