82665921 has 16 divisors (see below), whose sum is σ = 122794560. Its totient is φ = 49116480.

The previous prime is 82665901. The next prime is 82665923. The reversal of 82665921 is 12956628.

It is not a de Polignac number, because 82665921 - 2⁵ = 82665889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 82665921.

It is not an unprimeable number, because it can be changed into a prime (82665923) 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, 35415 + ... + 37676.

It is an arithmetic number, because the mean of its divisors is an integer number (7674660).

Almost surely, 2^82665921 is an apocalyptic number.

It is an amenable number.

82665921 is a deficient number, since it is larger than the sum of its proper divisors (40128639).

82665921 is a wasteful number, since it uses less digits than its factorization.

82665921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73136.

The product of its digits is 51840, while the sum is 39.

The square root of 82665921 is about 9092.0801250319. The cubic root of 82665921 is about 435.6210286740.

The spelling of 82665921 in words is "eighty-two million, six hundred sixty-five thousand, nine hundred twenty-one".