82789813 has 4 divisors (see below), whose sum is σ = 87659820. Its totient is φ = 77919808.

The previous prime is 82789807. The next prime is 82789829. The reversal of 82789813 is 31898728.

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 54508689 + 28281124 = 7383^2 + 5318^2 .

It is a cyclic number.

It is not a de Polignac number, because 82789813 - 2⁵ = 82789781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82789843) 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, 2434978 + ... + 2435011.

It is an arithmetic number, because the mean of its divisors is an integer number (21914955).

Almost surely, 2^82789813 is an apocalyptic number.

It is an amenable number.

82789813 is a deficient number, since it is larger than the sum of its proper divisors (4870007).

82789813 is a wasteful number, since it uses less digits than its factorization.

82789813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4870006.

The product of its digits is 193536, while the sum is 46.

The square root of 82789813 is about 9098.8907565703. The cubic root of 82789813 is about 435.8385428182.

The spelling of 82789813 in words is "eighty-two million, seven hundred eighty-nine thousand, eight hundred thirteen".