864069440 has 56 divisors (see below), whose sum is σ = 2215850280. Its totient is φ = 319039488.

The previous prime is 864069377. The next prime is 864069457. The reversal of 864069440 is 44960468.

It can be written as a sum of positive squares in 4 ways, for example, as 136796416 + 727273024 = 11696^2 + 26968^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99695 + ... + 108014.

It is an arithmetic number, because the mean of its divisors is an integer number (39568755).

Almost surely, 2^864069440 is an apocalyptic number.

864069440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

864069440 is an abundant number, since it is smaller than the sum of its proper divisors (1351780840).

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

864069440 is a wasteful number, since it uses less digits than its factorization.

864069440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207739 (or 207729 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 864069440 is about 29395.0580880528. The cubic root of 864069440 is about 952.4661464995.

The spelling of 864069440 in words is "eight hundred sixty-four million, sixty-nine thousand, four hundred forty".