815668 has 12 divisors (see below), whose sum is σ = 1631392. Its totient is φ = 349560.

The previous prime is 815663. The next prime is 815669. The reversal of 815668 is 866518.

It is a happy number.

815668 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14538 + ... + 14593.

2⁸¹⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

815668 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.

815668 is a wasteful number, since it uses less digits than its factorization.

815668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29142 (or 29140 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 815668 is about 903.1433994666. The cubic root of 815668 is about 93.4338995380.

The spelling of 815668 in words is "eight hundred fifteen thousand, six hundred sixty-eight".