668470 has 32 divisors (see below), whose sum is σ = 1347840. Its totient is φ = 236640.

The previous prime is 668417. The next prime is 668471. The reversal of 668470 is 74866.

668470 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668471) by changing a digit.

668470 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6439 + ... + 6541.

It is an arithmetic number, because the mean of its divisors is an integer number (42120).

2⁶⁶⁸⁴⁷⁰ is an apocalyptic number.

668470 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

668470 is a wasteful number, since it uses less digits than its factorization.

668470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 668470 is about 817.6001467710. The cubic root of 668470 is about 87.4367433964.

The spelling of 668470 in words is "six hundred sixty-eight thousand, four hundred seventy".