82171892 has 24 divisors (see below), whose sum is σ = 157110240. Its totient is φ = 37294560.

The previous prime is 82171891. The next prime is 82171937. The reversal of 82171892 is 29817128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82171891) 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 7 ways as a sum of consecutive naturals, for example, 46163 + ... + 47909.

It is an arithmetic number, because the mean of its divisors is an integer number (6546260).

Almost surely, 2^82171892 is an apocalyptic number.

It is an amenable number.

82171892 is a deficient number, since it is larger than the sum of its proper divisors (74938348).

82171892 is a wasteful number, since it uses less digits than its factorization.

82171892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831 (or 2829 counting only the distinct ones).

The product of its digits is 16128, while the sum is 38.

The square root of 82171892 is about 9064.8713173437. The cubic root of 82171892 is about 434.7515064656.

The spelling of 82171892 in words is "eighty-two million, one hundred seventy-one thousand, eight hundred ninety-two".