809885970 has 48 divisors (see below), whose sum is σ = 2162623320. Its totient is φ = 210131712.

The previous prime is 809885957. The next prime is 809885971. The reversal of 809885970 is 79588908.

It can be written as a sum of positive squares in 4 ways, for example, as 707613201 + 102272769 = 26601^2 + 10113^2 .

It is not an unprimeable number, because it can be changed into a prime (809885971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118275 + ... + 124934.

Almost surely, 2^809885970 is an apocalyptic number.

809885970 is an abundant number, since it is smaller than the sum of its proper divisors (1352737350).

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

809885970 is a wasteful number, since it uses less digits than its factorization.

809885970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243259 (or 243256 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The square root of 809885970 is about 28458.4955681076. The cubic root of 809885970 is about 932.1260068046.

The spelling of 809885970 in words is "eight hundred nine million, eight hundred eighty-five thousand, nine hundred seventy".