82171804 has 48 divisors (see below), whose sum is σ = 170797536. Its totient is φ = 34099200.

The previous prime is 82171777. The next prime is 82171811. The reversal of 82171804 is 40817128.

It is a super-2 number, since 2×82171804² = 13504410745228832, which contains 22 as substring.

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, 54744 + ... + 56224.

It is an arithmetic number, because the mean of its divisors is an integer number (3558282).

Almost surely, 2^82171804 is an apocalyptic number.

It is an amenable number.

82171804 is an abundant number, since it is smaller than the sum of its proper divisors (88625732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82171804 is a wasteful number, since it uses less digits than its factorization.

82171804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 82171804 is about 9064.8664634400. The cubic root of 82171804 is about 434.7513512700.

The spelling of 82171804 in words is "eighty-two million, one hundred seventy-one thousand, eight hundred four".