864415720 has 32 divisors (see below), whose sum is σ = 2222784000. Its totient is φ = 296371008.

The previous prime is 864415679. The next prime is 864415723. The reversal of 864415720 is 27514468.

It is a self number, because there is not a number n which added to its sum of digits gives 864415720.

It is not an unprimeable number, because it can be changed into a prime (864415723) 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, 1543320 + ... + 1543879.

It is an arithmetic number, because the mean of its divisors is an integer number (69462000).

Almost surely, 2^864415720 is an apocalyptic number.

It is an amenable number.

864415720 is an abundant number, since it is smaller than the sum of its proper divisors (1358368280).

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

864415720 is a wasteful number, since it uses less digits than its factorization.

864415720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087217 (or 3087213 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 864415720 is about 29400.9476037763. The cubic root of 864415720 is about 952.5933646422.

The spelling of 864415720 in words is "eight hundred sixty-four million, four hundred fifteen thousand, seven hundred twenty".