820312685 has 8 divisors (see below), whose sum is σ = 992126976. Its totient is φ = 651082320.

The previous prime is 820312651. The next prime is 820312709. The reversal of 820312685 is 586213028.

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

It is not a de Polignac number, because 820312685 - 2²⁰ = 819264109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645281 + ... + 646550.

It is an arithmetic number, because the mean of its divisors is an integer number (124015872).

Almost surely, 2^820312685 is an apocalyptic number.

It is an amenable number.

820312685 is a deficient number, since it is larger than the sum of its proper divisors (171814291).

820312685 is a wasteful number, since it uses less digits than its factorization.

820312685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291963.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 820312685 is about 28641.1013230986. The cubic root of 820312685 is about 936.1091187739.

The spelling of 820312685 in words is "eight hundred twenty million, three hundred twelve thousand, six hundred eighty-five".