815850873 has 28 divisors (see below), whose sum is σ = 1230477540. Its totient is φ = 540673056.

The previous prime is 815850857. The next prime is 815850877. The reversal of 815850873 is 378058518.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 376864569 + 438986304 = 19413^2 + 20952^2 .

It is not a de Polignac number, because 815850873 - 2⁴ = 815850857 is a prime.

It is a super-2 number, since 2×815850873² = 1331225293949724258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (815850877) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 122883 + ... + 129351.

Almost surely, 2^815850873 is an apocalyptic number.

It is an amenable number.

815850873 is a deficient number, since it is larger than the sum of its proper divisors (414626667).

815850873 is an equidigital number, since it uses as much as digits as its factorization.

815850873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6660 (or 6645 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 815850873 is about 28563.1033503014. The cubic root of 815850873 is about 934.4088165194.

The spelling of 815850873 in words is "eight hundred fifteen million, eight hundred fifty thousand, eight hundred seventy-three".