668899 has 24 divisors (see below), whose sum is σ = 911088. Its totient is φ = 483840.

The previous prime is 668879. The next prime is 668903. The reversal of 668899 is 998866.

It is a happy number.

668899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668899 - 2⁵ = 668867 is a prime.

668899 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

Its product of digits (186624) is a multiple of the sum of its prime divisors (108).

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (668869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9127 + ... + 9199.

It is an arithmetic number, because the mean of its divisors is an integer number (37962).

2⁶⁶⁸⁸⁹⁹ is an apocalyptic number.

668899 is a deficient number, since it is larger than the sum of its proper divisors (242189).

668899 is a wasteful number, since it uses less digits than its factorization.

668899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 108 counting only the distinct ones).

The product of its digits is 186624, while the sum is 46.

The square root of 668899 is about 817.8624578742. The cubic root of 668899 is about 87.4554439821.

The spelling of 668899 in words is "six hundred sixty-eight thousand, eight hundred ninety-nine".