82775579 has 4 divisors (see below), whose sum is σ = 82799976. Its totient is φ = 82751184.

The previous prime is 82775573. The next prime is 82775591. The reversal of 82775579 is 97557728.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82775579 - 2²⁰ = 81727003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82775573) 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, 6089 + ... + 14234.

It is an arithmetic number, because the mean of its divisors is an integer number (20699994).

Almost surely, 2^82775579 is an apocalyptic number.

82775579 is a deficient number, since it is larger than the sum of its proper divisors (24397).

82775579 is a wasteful number, since it uses less digits than its factorization.

82775579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24396.

The product of its digits is 1234800, while the sum is 50.

The square root of 82775579 is about 9098.1085396911. The cubic root of 82775579 is about 435.8135635719.

The spelling of 82775579 in words is "eighty-two million, seven hundred seventy-five thousand, five hundred seventy-nine".