864816784 has 20 divisors (see below), whose sum is σ = 1804473916. Its totient is φ = 399146112.

The previous prime is 864816761. The next prime is 864816803. The reversal of 864816784 is 487618468.

It can be written as a sum of positive squares in 2 ways, for example, as 437981184 + 426835600 = 20928^2 + 20660^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2078679 + ... + 2079094.

Almost surely, 2^864816784 is an apocalyptic number.

It is an amenable number.

864816784 is an abundant number, since it is smaller than the sum of its proper divisors (939657132).

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

864816784 is a wasteful number, since it uses less digits than its factorization.

864816784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157794 (or 4157788 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 52.

The square root of 864816784 is about 29407.7674093087. The cubic root of 864816784 is about 952.7406671591.

The spelling of 864816784 in words is "eight hundred sixty-four million, eight hundred sixteen thousand, seven hundred eighty-four".