8066821 has 12 divisors (see below), whose sum is σ = 9443532. Its totient is φ = 6870528.

The previous prime is 8066797. The next prime is 8066827. The reversal of 8066821 is 1286608.

It can be written as a sum of positive squares in 2 ways, for example, as 1102500 + 6964321 = 1050^2 + 2639^2 .

It is not a de Polignac number, because 8066821 - 2¹¹ = 8064773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8066827) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9031 + ... + 9883.

It is an arithmetic number, because the mean of its divisors is an integer number (786961).

Almost surely, 2^8066821 is an apocalyptic number.

It is an amenable number.

8066821 is a deficient number, since it is larger than the sum of its proper divisors (1376711).

8066821 is a wasteful number, since it uses less digits than its factorization.

8066821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1060 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 8066821 is about 2840.2149566538. The cubic root of 8066821 is about 200.5552984579. Note that the first 3 decimals are identical.

The spelling of 8066821 in words is "eight million, sixty-six thousand, eight hundred twenty-one".