668877 has 8 divisors (see below), whose sum is σ = 972960. Its totient is φ = 405360.

The previous prime is 668873. The next prime is 668879. The reversal of 668877 is 778866.

668877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 668877 - 2² = 668873 is a prime.

It is a super-2 number, since 2×668877² = 894792882258, which contains 22 as substring.

It is a zygodrome in base 10.

It is a congruent number.

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, 10102 + ... + 10167.

It is an arithmetic number, because the mean of its divisors is an integer number (121620).

2⁶⁶⁸⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

668877 is a deficient number, since it is larger than the sum of its proper divisors (304083).

668877 is a wasteful number, since it uses less digits than its factorization.

668877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20283.

The product of its digits is 112896, while the sum is 42.

The square root of 668877 is about 817.8490080693. The cubic root of 668877 is about 87.4544851722.

The spelling of 668877 in words is "six hundred sixty-eight thousand, eight hundred seventy-seven".