864989544 has 32 divisors (see below), whose sum is σ = 2166120000. Its totient is φ = 287843712.

The previous prime is 864989539. The next prime is 864989549. The reversal of 864989544 is 445989468.

864989544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (864989539) and next prime (864989549).

It is a super-2 number, since 2×864989544² = 1496413822458655872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (864989549) 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, 15709 + ... + 44460.

It is an arithmetic number, because the mean of its divisors is an integer number (67691250).

Almost surely, 2^864989544 is an apocalyptic number.

It is an amenable number.

864989544 is an abundant number, since it is smaller than the sum of its proper divisors (1301130456).

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

864989544 is a wasteful number, since it uses less digits than its factorization.

864989544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60777 (or 60773 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 57.

The square root of 864989544 is about 29410.7045818355. The cubic root of 864989544 is about 952.8041043024.

The spelling of 864989544 in words is "eight hundred sixty-four million, nine hundred eighty-nine thousand, five hundred forty-four".