808856820 has 96 divisors (see below), whose sum is σ = 2520672000. Its totient is φ = 215332992.

The previous prime is 808856819. The next prime is 808856827. The reversal of 808856820 is 28658808.

808856820 is a `hidden beast` number, since 8 + 0 + 88 + 568 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (808856827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 521406 + ... + 522954.

It is an arithmetic number, because the mean of its divisors is an integer number (26257000).

Almost surely, 2^808856820 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 808856820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1260336000).

808856820 is an abundant number, since it is smaller than the sum of its proper divisors (1711815180).

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

808856820 is a wasteful number, since it uses less digits than its factorization.

808856820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The square root of 808856820 is about 28440.4082249183. The cubic root of 808856820 is about 931.7310112373.

The spelling of 808856820 in words is "eight hundred eight million, eight hundred fifty-six thousand, eight hundred twenty".