864238220 has 12 divisors (see below), whose sum is σ = 1814900304. Its totient is φ = 345695280.

The previous prime is 864238213. The next prime is 864238229. The reversal of 864238220 is 22832468.

It is not an unprimeable number, because it can be changed into a prime (864238229) 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, 21605936 + ... + 21605975.

It is an arithmetic number, because the mean of its divisors is an integer number (151241692).

Almost surely, 2^864238220 is an apocalyptic number.

It is an amenable number.

864238220 is an abundant number, since it is smaller than the sum of its proper divisors (950662084).

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

864238220 is a wasteful number, since it uses less digits than its factorization.

864238220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43211920 (or 43211918 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 864238220 is about 29397.9288386104. The cubic root of 864238220 is about 952.5281580165.

The spelling of 864238220 in words is "eight hundred sixty-four million, two hundred thirty-eight thousand, two hundred twenty".