809015680 has 192 divisors, whose sum is σ = 2200947840. Its totient is φ = 283852800.

The previous prime is 809015657. The next prime is 809015681. The reversal of 809015680 is 86510908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809015681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2400472 + ... + 2400808.

It is an arithmetic number, because the mean of its divisors is an integer number (11463270).

Almost surely, 2^809015680 is an apocalyptic number.

809015680 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 809015680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100473920).

809015680 is an abundant number, since it is smaller than the sum of its proper divisors (1391932160).

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

809015680 is a wasteful number, since it uses less digits than its factorization.

809015680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 809015680 is about 28443.2009450413. The cubic root of 809015680 is about 931.7920047678.

The spelling of 809015680 in words is "eight hundred nine million, fifteen thousand, six hundred eighty".