810251020 has 24 divisors (see below), whose sum is σ = 1743029568. Its totient is φ = 316195200.

The previous prime is 810251009. The next prime is 810251023. The reversal of 810251020 is 20152018.

It is a super-2 number, since 2×810251020² = 1313013430822080800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (810251023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 493236 + ... + 494875.

It is an arithmetic number, because the mean of its divisors is an integer number (72626232).

Almost surely, 2^810251020 is an apocalyptic number.

It is an amenable number.

810251020 is an abundant number, since it is smaller than the sum of its proper divisors (932778548).

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

810251020 is a wasteful number, since it uses less digits than its factorization.

810251020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988161 (or 988159 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 810251020 is about 28464.9085717836. The cubic root of 810251020 is about 932.2660353597.

The spelling of 810251020 in words is "eight hundred ten million, two hundred fifty-one thousand, twenty".