864215233 has 4 divisors (see below), whose sum is σ = 987674560. Its totient is φ = 740755908.

The previous prime is 864215221. The next prime is 864215239. The reversal of 864215233 is 332512468.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864215233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864215239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61729653 + ... + 61729666.

It is an arithmetic number, because the mean of its divisors is an integer number (246918640).

Almost surely, 2^864215233 is an apocalyptic number.

It is an amenable number.

864215233 is a deficient number, since it is larger than the sum of its proper divisors (123459327).

864215233 is a wasteful number, since it uses less digits than its factorization.

864215233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123459326.

The product of its digits is 34560, while the sum is 34.

The square root of 864215233 is about 29397.5378730941. The cubic root of 864215233 is about 952.5197128300.

The spelling of 864215233 in words is "eight hundred sixty-four million, two hundred fifteen thousand, two hundred thirty-three".