820890785 has 16 divisors (see below), whose sum is σ = 1157284800. Its totient is φ = 551087040.

The previous prime is 820890743. The next prime is 820890797. The reversal of 820890785 is 587098028.

820890785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 820890785 - 2¹⁴ = 820874401 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 573335 + ... + 574764.

It is an arithmetic number, because the mean of its divisors is an integer number (72330300).

Almost surely, 2^820890785 is an apocalyptic number.

It is an amenable number.

820890785 is a deficient number, since it is larger than the sum of its proper divisors (336394015).

820890785 is a wasteful number, since it uses less digits than its factorization.

820890785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148128.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 820890785 is about 28651.1916855128. The cubic root of 820890785 is about 936.3289689262.

The spelling of 820890785 in words is "eight hundred twenty million, eight hundred ninety thousand, seven hundred eighty-five".