82179985 has 4 divisors (see below), whose sum is σ = 98615988. Its totient is φ = 65743984.

The previous prime is 82179983. The next prime is 82179991. The reversal of 82179985 is 58997128.

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 34680321 + 47499664 = 5889^2 + 6892^2 .

It is a cyclic number.

It is not a de Polignac number, because 82179985 - 2¹ = 82179983 is a prime.

It is a Smith number, since the sum of its digits (49) 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 (82179983) 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, 8217994 + ... + 8218003.

It is an arithmetic number, because the mean of its divisors is an integer number (24653997).

Almost surely, 2^82179985 is an apocalyptic number.

It is an amenable number.

82179985 is a deficient number, since it is larger than the sum of its proper divisors (16436003).

82179985 is a wasteful number, since it uses less digits than its factorization.

82179985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16436002.

The product of its digits is 362880, while the sum is 49.

The square root of 82179985 is about 9065.3176998934. The cubic root of 82179985 is about 434.7657786956.

The spelling of 82179985 in words is "eighty-two million, one hundred seventy-nine thousand, nine hundred eighty-five".