813706885 has 8 divisors (see below), whose sum is σ = 976857336. Its totient is φ = 650692800.

The previous prime is 813706867. The next prime is 813706913. The reversal of 813706885 is 588607318.

It can be written as a sum of positive squares in 4 ways, for example, as 269977761 + 543729124 = 16431^2 + 23318^2 .

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

It is not a de Polignac number, because 813706885 - 2¹⁷ = 813575813 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 20466 + ... + 45235.

It is an arithmetic number, because the mean of its divisors is an integer number (122107167).

Almost surely, 2^813706885 is an apocalyptic number.

It is an amenable number.

813706885 is a deficient number, since it is larger than the sum of its proper divisors (163150451).

813706885 is a wasteful number, since it uses less digits than its factorization.

813706885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68183.

The product of its (nonzero) digits is 322560, while the sum is 46.

The square root of 813706885 is about 28525.5479351405. The cubic root of 813706885 is about 933.5895823467.

The spelling of 813706885 in words is "eight hundred thirteen million, seven hundred six thousand, eight hundred eighty-five".