82579821 has 8 divisors (see below), whose sum is σ = 114893760. Its totient is φ = 52659552.

The previous prime is 82579813. The next prime is 82579831. The reversal of 82579821 is 12897528.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 82579821 - 2³ = 82579813 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82579831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598336 + ... + 598473.

It is an arithmetic number, because the mean of its divisors is an integer number (14361720).

Almost surely, 2^82579821 is an apocalyptic number.

It is an amenable number.

82579821 is a deficient number, since it is larger than the sum of its proper divisors (32313939).

82579821 is a wasteful number, since it uses less digits than its factorization.

82579821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1196835.

The product of its digits is 80640, while the sum is 42.

The square root of 82579821 is about 9087.3440014121. The cubic root of 82579821 is about 435.4697369875.

The spelling of 82579821 in words is "eighty-two million, five hundred seventy-nine thousand, eight hundred twenty-one".