864205992 has 96 divisors (see below), whose sum is σ = 2530644480. Its totient is φ = 264850560.

The previous prime is 864205987. The next prime is 864206009. The reversal of 864205992 is 299502468.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 251953 + ... + 255359.

It is an arithmetic number, because the mean of its divisors is an integer number (26360880).

Almost surely, 2^864205992 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 864205992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1265322240).

864205992 is an abundant number, since it is smaller than the sum of its proper divisors (1666438488).

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

864205992 is a wasteful number, since it uses less digits than its factorization.

864205992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3703 (or 3696 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 864205992 is about 29397.3806996474. The cubic root of 864205992 is about 952.5163177398.

The spelling of 864205992 in words is "eight hundred sixty-four million, two hundred five thousand, nine hundred ninety-two".