82786013 has 4 divisors (see below), whose sum is σ = 82994940. Its totient is φ = 82577088.

The previous prime is 82786003. The next prime is 82786087. The reversal of 82786013 is 31068728.

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 67207204 + 15578809 = 8198^2 + 3947^2 .

It is a cyclic number.

It is not a de Polignac number, because 82786013 - 2⁸ = 82785757 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 (82786003) 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, 103868 + ... + 104661.

It is an arithmetic number, because the mean of its divisors is an integer number (20748735).

Almost surely, 2^82786013 is an apocalyptic number.

It is an amenable number.

82786013 is a deficient number, since it is larger than the sum of its proper divisors (208927).

82786013 is a wasteful number, since it uses less digits than its factorization.

82786013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208926.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 82786013 is about 9098.6819375116. The cubic root of 82786013 is about 435.8318744785.

The spelling of 82786013 in words is "eighty-two million, seven hundred eighty-six thousand, thirteen".