82000813 has 4 divisors (see below), whose sum is σ = 82117180. Its totient is φ = 81884448.

The previous prime is 82000801. The next prime is 82000829. The reversal of 82000813 is 31800028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14152644 + 67848169 = 3762^2 + 8237^2 .

It is a cyclic number.

It is not a de Polignac number, because 82000813 - 2⁵ = 82000781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82000913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57120 + ... + 58537.

It is an arithmetic number, because the mean of its divisors is an integer number (20529295).

Almost surely, 2^82000813 is an apocalyptic number.

It is an amenable number.

82000813 is a deficient number, since it is larger than the sum of its proper divisors (116367).

82000813 is a wasteful number, since it uses less digits than its factorization.

82000813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116366.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 82000813 is about 9055.4300284415. The cubic root of 82000813 is about 434.4495843703.

The spelling of 82000813 in words is "eighty-two million, eight hundred thirteen", and thus it is an aban number.