82170856 has 16 divisors (see below), whose sum is σ = 156241440. Its totient is φ = 40506480.

The previous prime is 82170841. The next prime is 82170871. The reversal of 82170856 is 65807128.

It is an interprime number because it is at equal distance from previous prime (82170841) and next prime (82170871).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71766 + ... + 72901.

It is an arithmetic number, because the mean of its divisors is an integer number (9765090).

Almost surely, 2^82170856 is an apocalyptic number.

It is an amenable number.

82170856 is a deficient number, since it is larger than the sum of its proper divisors (74070584).

82170856 is a wasteful number, since it uses less digits than its factorization.

82170856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144744 (or 144740 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 82170856 is about 9064.8141734952. The cubic root of 82170856 is about 434.7496793832.

The spelling of 82170856 in words is "eighty-two million, one hundred seventy thousand, eight hundred fifty-six".