82408321 has 4 divisors (see below), whose sum is σ = 82901952. Its totient is φ = 81914692.

The previous prime is 82408283. The next prime is 82408327. The reversal of 82408321 is 12380428.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82408321 - 2¹⁷ = 82277249 is a prime.

It is a super-2 number, since 2×82408321² = 13582262740078082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 82408321.

It is not an unprimeable number, because it can be changed into a prime (82408327) 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 3 ways as a sum of consecutive naturals, for example, 246565 + ... + 246898.

It is an arithmetic number, because the mean of its divisors is an integer number (20725488).

Almost surely, 2^82408321 is an apocalyptic number.

It is an amenable number.

82408321 is a deficient number, since it is larger than the sum of its proper divisors (493631).

82408321 is a wasteful number, since it uses less digits than its factorization.

82408321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493630.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 82408321 is about 9077.9028965946. The cubic root of 82408321 is about 435.1680699912.

Adding to 82408321 its reverse (12380428), we get a palindrome (94788749).

It can be divided in two parts, 8240 and 8321, that added together give a palindrome (16561).

The spelling of 82408321 in words is "eighty-two million, four hundred eight thousand, three hundred twenty-one".