808621440 has 128 divisors (see below), whose sum is σ = 2811870720. Its totient is φ = 196024320.

The previous prime is 808621423. The next prime is 808621469. The reversal of 808621440 is 44126808.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1977 + ... + 40263.

It is an arithmetic number, because the mean of its divisors is an integer number (21967740).

Almost surely, 2^808621440 is an apocalyptic number.

808621440 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 808621440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1405935360).

808621440 is an abundant number, since it is smaller than the sum of its proper divisors (2003249280).

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

808621440 is a wasteful number, since it uses less digits than its factorization.

808621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38320 (or 38308 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 808621440 is about 28436.2697975666. The cubic root of 808621440 is about 931.6406235375.

The spelling of 808621440 in words is "eight hundred eight million, six hundred twenty-one thousand, four hundred forty".