864680 has 16 divisors (see below), whose sum is σ = 1945620. Its totient is φ = 345856.

The previous prime is 864679. The next prime is 864691. The reversal of 864680 is 86468.

864680 = 110² + 111² + ... + 157².

It can be written as a sum of positive squares in 2 ways, for example, as 813604 + 51076 = 902^2 + 226^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10769 + ... + 10848.

2⁸⁶⁴⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

864680 is an abundant number, since it is smaller than the sum of its proper divisors (1080940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

864680 is a wasteful number, since it uses less digits than its factorization.

864680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21628 (or 21624 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 864680 is about 929.8817129076. The cubic root of 864680 is about 95.2690434342.

The spelling of 864680 in words is "eight hundred sixty-four thousand, six hundred eighty".