82808513 has 4 divisors (see below), whose sum is σ = 87679620. Its totient is φ = 77937408.

The previous prime is 82808503. The next prime is 82808527. The reversal of 82808513 is 31580828.

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 30217009 + 52591504 = 5497^2 + 7252^2 .

It is a cyclic number.

It is not a de Polignac number, because 82808513 - 2¹⁰ = 82807489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82808503) 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, 2435528 + ... + 2435561.

It is an arithmetic number, because the mean of its divisors is an integer number (21919905).

Almost surely, 2^82808513 is an apocalyptic number.

It is an amenable number.

82808513 is a deficient number, since it is larger than the sum of its proper divisors (4871107).

82808513 is a wasteful number, since it uses less digits than its factorization.

82808513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4871106.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 82808513 is about 9099.9182963365. The cubic root of 82808513 is about 435.8713550967.

The spelling of 82808513 in words is "eighty-two million, eight hundred eight thousand, five hundred thirteen".