668870 has 16 divisors (see below), whose sum is σ = 1213488. Its totient is φ = 265440.

The previous prime is 668869. The next prime is 668873. The reversal of 668870 is 78866.

It is a self number, because there is not a number n which added to its sum of digits gives 668870.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668870.

It is not an unprimeable number, because it can be changed into a prime (668873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1952 + ... + 2268.

It is an arithmetic number, because the mean of its divisors is an integer number (75843).

2⁶⁶⁸⁸⁷⁰ is an apocalyptic number.

668870 is a deficient number, since it is larger than the sum of its proper divisors (544618).

668870 is a wasteful number, since it uses less digits than its factorization.

668870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 668870 is about 817.8447285396. The cubic root of 668870 is about 87.4541800919.

The spelling of 668870 in words is "six hundred sixty-eight thousand, eight hundred seventy".