82579865 has 4 divisors (see below), whose sum is σ = 99095844. Its totient is φ = 66063888.

The previous prime is 82579853. The next prime is 82579879. The reversal of 82579865 is 56897528.

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 63952009 + 18627856 = 7997^2 + 4316^2 .

It is a cyclic number.

It is not a de Polignac number, because 82579865 - 2¹⁸ = 82317721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8257982 + ... + 8257991.

It is an arithmetic number, because the mean of its divisors is an integer number (24773961).

Almost surely, 2^82579865 is an apocalyptic number.

It is an amenable number.

82579865 is a deficient number, since it is larger than the sum of its proper divisors (16515979).

82579865 is a wasteful number, since it uses less digits than its factorization.

82579865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16515978.

The product of its digits is 1209600, while the sum is 50.

The square root of 82579865 is about 9087.3464223612. The cubic root of 82579865 is about 435.4698143295.

The spelling of 82579865 in words is "eighty-two million, five hundred seventy-nine thousand, eight hundred sixty-five".