864215240 has 64 divisors (see below), whose sum is σ = 2225180160. Its totient is φ = 295914240.

The previous prime is 864215239. The next prime is 864215251. The reversal of 864215240 is 42512468.

It is a junction number, because it is equal to n+sod(n) for n = 864215197 and 864215206.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284369 + ... + 287391.

It is an arithmetic number, because the mean of its divisors is an integer number (34768440).

Almost surely, 2^864215240 is an apocalyptic number.

It is an amenable number.

864215240 is an abundant number, since it is smaller than the sum of its proper divisors (1360964920).

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

864215240 is a wasteful number, since it uses less digits than its factorization.

864215240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062 (or 4058 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 864215240 is about 29397.5379921517. The cubic root of 864215240 is about 952.5197154017.

The spelling of 864215240 in words is "eight hundred sixty-four million, two hundred fifteen thousand, two hundred forty".