817825220 has 12 divisors (see below), whose sum is σ = 1717433004. Its totient is φ = 327130080.

The previous prime is 817825187. The next prime is 817825243. The reversal of 817825220 is 22528718.

It can be written as a sum of positive squares in 2 ways, for example, as 540469504 + 277355716 = 23248^2 + 16654^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20445611 + ... + 20445650.

It is an arithmetic number, because the mean of its divisors is an integer number (143119417).

Almost surely, 2^817825220 is an apocalyptic number.

It is an amenable number.

817825220 is an abundant number, since it is smaller than the sum of its proper divisors (899607784).

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

817825220 is a wasteful number, since it uses less digits than its factorization.

817825220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40891270 (or 40891268 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 817825220 is about 28597.6436092207. The cubic root of 817825220 is about 935.1619611338.

The spelling of 817825220 in words is "eight hundred seventeen million, eight hundred twenty-five thousand, two hundred twenty".