809156928 has 112 divisors (see below), whose sum is σ = 2258202240. Its totient is φ = 255197184.

The previous prime is 809156903. The next prime is 809156969. The reversal of 809156928 is 829651908.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 427408 + ... + 429296.

It is an arithmetic number, because the mean of its divisors is an integer number (20162520).

Almost surely, 2^809156928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 809156928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129101120).

809156928 is an abundant number, since it is smaller than the sum of its proper divisors (1449045312).

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

809156928 is a wasteful number, since it uses less digits than its factorization.

809156928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024 (or 2014 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 809156928 is about 28445.6838202213. The cubic root of 809156928 is about 931.8462295505.

The spelling of 809156928 in words is "eight hundred nine million, one hundred fifty-six thousand, nine hundred twenty-eight".