82456681 has 4 divisors (see below), whose sum is σ = 87307092. Its totient is φ = 77606272.

The previous prime is 82456669. The next prime is 82456691. The reversal of 82456681 is 18665428.

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 42968025 + 39488656 = 6555^2 + 6284^2 .

It is a cyclic number.

It is not a de Polignac number, because 82456681 - 2⁹ = 82456169 is a prime.

It is a super-2 number, since 2×82456681² = 13598208483071522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82456691) 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, 2425180 + ... + 2425213.

It is an arithmetic number, because the mean of its divisors is an integer number (21826773).

Almost surely, 2^82456681 is an apocalyptic number.

It is an amenable number.

82456681 is a deficient number, since it is larger than the sum of its proper divisors (4850411).

82456681 is a wasteful number, since it uses less digits than its factorization.

82456681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850410.

The product of its digits is 92160, while the sum is 40.

The square root of 82456681 is about 9080.5661167132. The cubic root of 82456681 is about 435.2531771436.

The spelling of 82456681 in words is "eighty-two million, four hundred fifty-six thousand, six hundred eighty-one".