82685813 has 4 divisors (see below), whose sum is σ = 94498080. Its totient is φ = 70873548.

The previous prime is 82685809. The next prime is 82685821. The reversal of 82685813 is 31858628.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82685813 - 2² = 82685809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82685803) 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, 5906123 + ... + 5906136.

It is an arithmetic number, because the mean of its divisors is an integer number (23624520).

Almost surely, 2^82685813 is an apocalyptic number.

It is an amenable number.

82685813 is a deficient number, since it is larger than the sum of its proper divisors (11812267).

82685813 is a wasteful number, since it uses less digits than its factorization.

82685813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11812266.

The product of its digits is 92160, while the sum is 41.

The square root of 82685813 is about 9093.1739783202. The cubic root of 82685813 is about 435.6559672091.

The spelling of 82685813 in words is "eighty-two million, six hundred eighty-five thousand, eight hundred thirteen".