82218817 has 16 divisors (see below), whose sum is σ = 89812800. Its totient is φ = 74959360.

The previous prime is 82218811. The next prime is 82218841. The reversal of 82218817 is 71881228.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82218817 is a prime.

It is a Duffinian number.

Its product of digits (14336) is a multiple of the sum of its prime divisors (896).

It is not an unprimeable number, because it can be changed into a prime (82218811) 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 15 ways as a sum of consecutive naturals, for example, 124434 + ... + 125092.

It is an arithmetic number, because the mean of its divisors is an integer number (5613300).

Almost surely, 2^82218817 is an apocalyptic number.

It is an amenable number.

82218817 is a deficient number, since it is larger than the sum of its proper divisors (7593983).

82218817 is a wasteful number, since it uses less digits than its factorization.

82218817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896.

The product of its digits is 14336, while the sum is 37.

The square root of 82218817 is about 9067.4592361918. The cubic root of 82218817 is about 434.8342469739.

The spelling of 82218817 in words is "eighty-two million, two hundred eighteen thousand, eight hundred seventeen".