82666647 has 12 divisors (see below), whose sum is σ = 136465680. Its totient is φ = 47238048.

The previous prime is 82666637. The next prime is 82666657. The reversal of 82666647 is 74666628.

It is an interprime number because it is at equal distance from previous prime (82666637) and next prime (82666657).

It is not a de Polignac number, because 82666647 - 2¹⁸ = 82404503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82666607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 656022 + ... + 656147.

It is an arithmetic number, because the mean of its divisors is an integer number (11372140).

Almost surely, 2^82666647 is an apocalyptic number.

82666647 is a deficient number, since it is larger than the sum of its proper divisors (53799033).

82666647 is a wasteful number, since it uses less digits than its factorization.

82666647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312182 (or 1312179 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 82666647 is about 9092.1200498014. The cubic root of 82666647 is about 435.6223039272.

The spelling of 82666647 in words is "eighty-two million, six hundred sixty-six thousand, six hundred forty-seven".