82507813 has 4 divisors (see below), whose sum is σ = 85352940. Its totient is φ = 79662688.

The previous prime is 82507811. The next prime is 82507849. The reversal of 82507813 is 31870528.

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 61732449 + 20775364 = 7857^2 + 4558^2 .

It is a cyclic number.

It is not a de Polignac number, because 82507813 - 2¹ = 82507811 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 (82507811) 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, 1422520 + ... + 1422577.

It is an arithmetic number, because the mean of its divisors is an integer number (21338235).

Almost surely, 2^82507813 is an apocalyptic number.

It is an amenable number.

82507813 is a deficient number, since it is larger than the sum of its proper divisors (2845127).

82507813 is a wasteful number, since it uses less digits than its factorization.

82507813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845126.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 82507813 is about 9083.3811436051. The cubic root of 82507813 is about 435.3431264622.

The spelling of 82507813 in words is "eighty-two million, five hundred seven thousand, eight hundred thirteen".