82421564 has 6 divisors (see below), whose sum is σ = 144237744. Its totient is φ = 41210780.

The previous prime is 82421561. The next prime is 82421587. The reversal of 82421564 is 46512428.

It is a self number, because there is not a number n which added to its sum of digits gives 82421564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82421561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10302692 + ... + 10302699.

It is an arithmetic number, because the mean of its divisors is an integer number (24039624).

Almost surely, 2^82421564 is an apocalyptic number.

It is an amenable number.

82421564 is a deficient number, since it is larger than the sum of its proper divisors (61816180).

82421564 is a wasteful number, since it uses less digits than its factorization.

82421564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20605395 (or 20605393 counting only the distinct ones).

The product of its digits is 15360, while the sum is 32.

The square root of 82421564 is about 9078.6322758442. The cubic root of 82421564 is about 435.1913792153.

The spelling of 82421564 in words is "eighty-two million, four hundred twenty-one thousand, five hundred sixty-four".