800081440 has 48 divisors (see below), whose sum is σ = 1898127000. Its totient is φ = 318689280.

The previous prime is 800081437. The next prime is 800081461. The reversal of 800081440 is 44180008.

It can be written as a sum of positive squares in 4 ways, for example, as 514200976 + 285880464 = 22676^2 + 16908^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28186 + ... + 48934.

Almost surely, 2^800081440 is an apocalyptic number.

800081440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 800081440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949063500).

800081440 is an abundant number, since it is smaller than the sum of its proper divisors (1098045560).

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

800081440 is a wasteful number, since it uses less digits than its factorization.

800081440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21005 (or 20997 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 800081440 is about 28285.7108802307. The cubic root of 800081440 is about 928.3492665699.

The spelling of 800081440 in words is "eight hundred million, eighty-one thousand, four hundred forty".