810868994 has 8 divisors (see below), whose sum is σ = 1309865340. Its totient is φ = 374247216.

The previous prime is 810868987. The next prime is 810868997. The reversal of 810868994 is 499868018.

It can be written as a sum of positive squares in 2 ways, for example, as 794506969 + 16362025 = 28187^2 + 4045^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (810868997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15593609 + ... + 15593660.

Almost surely, 2^810868994 is an apocalyptic number.

810868994 is a deficient number, since it is larger than the sum of its proper divisors (498996346).

810868994 is a wasteful number, since it uses less digits than its factorization.

810868994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31187284.

The product of its (nonzero) digits is 995328, while the sum is 53.

The square root of 810868994 is about 28475.7615174731. The cubic root of 810868994 is about 932.5029865233.

The spelling of 810868994 in words is "eight hundred ten million, eight hundred sixty-eight thousand, nine hundred ninety-four".