8906605821 has 6 divisors (see below), whose sum is σ = 12865097310. Its totient is φ = 5937737208.

The previous prime is 8906605819. The next prime is 8906605921. The reversal of 8906605821 is 1285066098.

8906605821 is a `hidden beast` number, since 8 + 9 + 0 + 6 + 60 + 582 + 1 = 666.

8906605821 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7176461796 + 1730144025 = 84714^2 + 41595^2 .

It is not a de Polignac number, because 8906605821 - 2¹ = 8906605819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8906605811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 494811426 + ... + 494811443.

It is an arithmetic number, because the mean of its divisors is an integer number (2144182885).

Almost surely, 2^8906605821 is an apocalyptic number.

It is an amenable number.

8906605821 is a deficient number, since it is larger than the sum of its proper divisors (3958491489).

8906605821 is a wasteful number, since it uses less digits than its factorization.

8906605821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989622875 (or 989622872 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 8906605821 is about 94374.8156077669. The cubic root of 8906605821 is about 2072.8636896275.

The spelling of 8906605821 in words is "eight billion, nine hundred six million, six hundred five thousand, eight hundred twenty-one".