82176813 has 6 divisors (see below), whose sum is σ = 118699854. Its totient is φ = 54784536.

The previous prime is 82176811. The next prime is 82176869. The reversal of 82176813 is 31867128.

It can be written as a sum of positive squares in only one way, i.e., 46212804 + 35964009 = 6798^2 + 5997^2 .

It is not a de Polignac number, because 82176813 - 2¹ = 82176811 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82176811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4565370 + ... + 4565387.

It is an arithmetic number, because the mean of its divisors is an integer number (19783309).

Almost surely, 2^82176813 is an apocalyptic number.

It is an amenable number.

82176813 is a deficient number, since it is larger than the sum of its proper divisors (36523041).

82176813 is a wasteful number, since it uses less digits than its factorization.

82176813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130763 (or 9130760 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 82176813 is about 9065.1427457046. The cubic root of 82176813 is about 434.7601848973.

The spelling of 82176813 in words is "eighty-two million, one hundred seventy-six thousand, eight hundred thirteen".