868685815 has 16 divisors (see below), whose sum is σ = 1071614592. Its totient is φ = 675523584.

The previous prime is 868685803. The next prime is 868685837. The reversal of 868685815 is 518586868.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 868685815 - 2⁹ = 868685303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312562 + ... + 315328.

It is an arithmetic number, because the mean of its divisors is an integer number (66975912).

Almost surely, 2^868685815 is an apocalyptic number.

868685815 is a deficient number, since it is larger than the sum of its proper divisors (202928777).

868685815 is a wasteful number, since it uses less digits than its factorization.

868685815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506.

The product of its digits is 3686400, while the sum is 55.

The square root of 868685815 is about 29473.4764661382. The cubic root of 868685815 is about 954.1593490367.

The spelling of 868685815 in words is "eight hundred sixty-eight million, six hundred eighty-five thousand, eight hundred fifteen".