864564646 has 32 divisors (see below), whose sum is σ = 1478126880. Its totient is φ = 375648000.

The previous prime is 864564643. The next prime is 864564653. The reversal of 864564646 is 646465468.

It is a super-2 number, since 2×864564646² = 1494944054226210632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 864564646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864564643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57730 + ... + 71146.

It is an arithmetic number, because the mean of its divisors is an integer number (46191465).

Almost surely, 2^864564646 is an apocalyptic number.

864564646 is a deficient number, since it is larger than the sum of its proper divisors (613562234).

864564646 is a wasteful number, since it uses less digits than its factorization.

864564646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13560.

The product of its digits is 3317760, while the sum is 49.

The square root of 864564646 is about 29403.4801681706. The cubic root of 864564646 is about 952.6480674007.

The spelling of 864564646 in words is "eight hundred sixty-four million, five hundred sixty-four thousand, six hundred forty-six".