863660 has 48 divisors (see below), whose sum is σ = 2150400. Its totient is φ = 285120.

The previous prime is 863641. The next prime is 863671. The reversal of 863660 is 66368.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4241 + ... + 4439.

It is an arithmetic number, because the mean of its divisors is an integer number (44800).

2⁸⁶³⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1075200).

863660 is an abundant number, since it is smaller than the sum of its proper divisors (1286740).

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

863660 is a wasteful number, since it uses less digits than its factorization.

863660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 863660 is about 929.3330942133. Note that the first 3 decimals coincide. The cubic root of 863660 is about 95.2315680447.

The spelling of 863660 in words is "eight hundred sixty-three thousand, six hundred sixty".