82191885 has 16 divisors (see below), whose sum is σ = 132135360. Its totient is φ = 43626240.

The previous prime is 82191871. The next prime is 82191913. The reversal of 82191885 is 58819128.

It is not a de Polignac number, because 82191885 - 2⁴ = 82191869 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9820 + ... + 16149.

It is an arithmetic number, because the mean of its divisors is an integer number (8258460).

Almost surely, 2^82191885 is an apocalyptic number.

It is an amenable number.

82191885 is a deficient number, since it is larger than the sum of its proper divisors (49943475).

82191885 is a wasteful number, since it uses less digits than its factorization.

82191885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26188.

The product of its digits is 46080, while the sum is 42.

The square root of 82191885 is about 9065.9740237881. The cubic root of 82191885 is about 434.7867629741.

The spelling of 82191885 in words is "eighty-two million, one hundred ninety-one thousand, eight hundred eighty-five".