868864 has 20 divisors (see below), whose sum is σ = 1737054. Its totient is φ = 434176.

The previous prime is 868849. The next prime is 868867. The reversal of 868864 is 468868.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 518400 + 350464 = 720^2 + 592^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (868867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 337 + ... + 1360.

2⁸⁶⁸⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

868864 is a deficient number, since it is larger than the sum of its proper divisors (868190).

868864 is an equidigital number, since it uses as much as digits as its factorization.

868864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715 (or 1699 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 868864 is about 932.1287464723. The cubic root of 868864 is about 95.4224583692.

The spelling of 868864 in words is "eight hundred sixty-eight thousand, eight hundred sixty-four".