82639817 has 6 divisors (see below), whose sum is σ = 89485902. Its totient is φ = 76282752.

The previous prime is 82639801. The next prime is 82639819. The reversal of 82639817 is 71893628.

It can be written as a sum of positive squares in 3 ways, for example, as 5621641 + 77018176 = 2371^2 + 8776^2 .

It is not a de Polignac number, because 82639817 - 2⁴ = 82639801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82639819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 244328 + ... + 244665.

It is an arithmetic number, because the mean of its divisors is an integer number (14914317).

Almost surely, 2^82639817 is an apocalyptic number.

It is an amenable number.

82639817 is a deficient number, since it is larger than the sum of its proper divisors (6846085).

82639817 is a wasteful number, since it uses less digits than its factorization.

82639817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489019 (or 489006 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 82639817 is about 9090.6444766034. The cubic root of 82639817 is about 435.5751708067.

The spelling of 82639817 in words is "eighty-two million, six hundred thirty-nine thousand, eight hundred seventeen".