82163979 has 6 divisors (see below), whose sum is σ = 118681316. Its totient is φ = 54775980.

The previous prime is 82163957. The next prime is 82163987. The reversal of 82163979 is 97936128.

82163979 is a `hidden beast` number, since 8 + 2 + 1 + 639 + 7 + 9 = 666.

It is not a de Polignac number, because 82163979 - 2⁸ = 82163723 is a prime.

It is a super-2 number, since 2×82163979² = 13501838890224882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82163929) 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, 4564657 + ... + 4564674.

Almost surely, 2^82163979 is an apocalyptic number.

82163979 is a deficient number, since it is larger than the sum of its proper divisors (36517337).

82163979 is a wasteful number, since it uses less digits than its factorization.

82163979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9129337 (or 9129334 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 82163979 is about 9064.4348417317. The cubic root of 82163979 is about 434.7375507644.

The spelling of 82163979 in words is "eighty-two million, one hundred sixty-three thousand, nine hundred seventy-nine".