817958985 has 8 divisors (see below), whose sum is σ = 1308734400. Its totient is φ = 436244784.

The previous prime is 817958881. The next prime is 817958993. The reversal of 817958985 is 589859718.

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

It is not a de Polignac number, because 817958985 - 2¹⁵ = 817926217 is a prime.

It is a super-2 number, since 2×817958985² = 1338113802284460450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27265285 + ... + 27265314.

It is an arithmetic number, because the mean of its divisors is an integer number (163591800).

Almost surely, 2^817958985 is an apocalyptic number.

It is an amenable number.

817958985 is a deficient number, since it is larger than the sum of its proper divisors (490775415).

817958985 is a wasteful number, since it uses less digits than its factorization.

817958985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54530607.

The product of its digits is 7257600, while the sum is 60.

The square root of 817958985 is about 28599.9822552393. The cubic root of 817958985 is about 935.2129439588.

The spelling of 817958985 in words is "eight hundred seventeen million, nine hundred fifty-eight thousand, nine hundred eighty-five".