865680 has 40 divisors (see below), whose sum is σ = 2684352. Its totient is φ = 230784.

The previous prime is 865661. The next prime is 865681. The reversal of 865680 is 86568.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (865681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1564 + ... + 2043.

2⁸⁶⁵⁶⁸⁰ is an apocalyptic number.

865680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865680 is an abundant number, since it is smaller than the sum of its proper divisors (1818672).

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

865680 is a wasteful number, since it uses less digits than its factorization.

865680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3623 (or 3617 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 865680 is about 930.4192603337. The cubic root of 865680 is about 95.3057554127.

The spelling of 865680 in words is "eight hundred sixty-five thousand, six hundred eighty".