865243660 has 24 divisors (see below), whose sum is σ = 1912644720. Its totient is φ = 327881664.

The previous prime is 865243649. The next prime is 865243663. The reversal of 865243660 is 66342568.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (865243663) 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, 1138099 + ... + 1138858.

It is an arithmetic number, because the mean of its divisors is an integer number (79693530).

Almost surely, 2^865243660 is an apocalyptic number.

It is an amenable number.

865243660 is an abundant number, since it is smaller than the sum of its proper divisors (1047401060).

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

865243660 is a wasteful number, since it uses less digits than its factorization.

865243660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276985 (or 2276983 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 865243660 is about 29415.0243923067. The cubic root of 865243660 is about 952.8973998661.

The spelling of 865243660 in words is "eight hundred sixty-five million, two hundred forty-three thousand, six hundred sixty".