868583440 has 20 divisors (see below), whose sum is σ = 2019456684. Its totient is φ = 347433344.

The previous prime is 868583411. The next prime is 868583449. The reversal of 868583440 is 44385868.

It can be written as a sum of positive squares in 2 ways, for example, as 147768336 + 720815104 = 12156^2 + 26848^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (868583449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5428567 + ... + 5428726.

Almost surely, 2^868583440 is an apocalyptic number.

868583440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

868583440 is an abundant number, since it is smaller than the sum of its proper divisors (1150873244).

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

868583440 is a wasteful number, since it uses less digits than its factorization.

868583440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857306 (or 10857300 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 46.

The square root of 868583440 is about 29471.7396839752. The cubic root of 868583440 is about 954.1218648665.

The spelling of 868583440 in words is "eight hundred sixty-eight million, five hundred eighty-three thousand, four hundred forty".