82864609 has 3 divisors (see below), whose sum is σ = 82873713. Its totient is φ = 82855506.

The previous prime is 82864603. The next prime is 82864631. The reversal of 82864609 is 90646828.

It is a happy number.

The square root of 82864609 is 9103.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 82864609 - 2⁵ = 82864577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82864603) 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 2 ways as a sum of consecutive naturals, for example, 4552 + ... + 13654.

It is an arithmetic number, because the mean of its divisors is an integer number (27624571).

Almost surely, 2^82864609 is an apocalyptic number.

82864609 is the 9103-rd square number.

82864609 is the 4552-nd centered octagonal number.

It is an amenable number.

82864609 is a deficient number, since it is larger than the sum of its proper divisors (9104).

82864609 is an frugal number, since it uses more digits than its factorization.

82864609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18206 (or 9103 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The cubic root of 82864609 is about 435.9697552878.

The spelling of 82864609 in words is "eighty-two million, eight hundred sixty-four thousand, six hundred nine".