821604685 has 8 divisors (see below), whose sum is σ = 1075555296. Its totient is φ = 597530640.

The previous prime is 821604673. The next prime is 821604691. The reversal of 821604685 is 586406128.

821604685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 821604685 - 2⁵ = 821604653 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, 7469079 + ... + 7469188.

It is an arithmetic number, because the mean of its divisors is an integer number (134444412).

Almost surely, 2^821604685 is an apocalyptic number.

It is an amenable number.

821604685 is a deficient number, since it is larger than the sum of its proper divisors (253950611).

821604685 is a wasteful number, since it uses less digits than its factorization.

821604685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14938283.

The product of its (nonzero) digits is 92160, while the sum is 40.

The square root of 821604685 is about 28663.6474475947. The cubic root of 821604685 is about 936.6003211297.

It can be divided in two parts, 821 and 604685, that added together give a palindrome (605506).

The spelling of 821604685 in words is "eight hundred twenty-one million, six hundred four thousand, six hundred eighty-five".