171680856 has 16 divisors (see below), whose sum is σ = 429202200. Its totient is φ = 57226944.

The previous prime is 171680837. The next prime is 171680879. The reversal of 171680856 is 658086171.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3576661 + ... + 3576708.

Almost surely, 2^171680856 is an apocalyptic number.

It is an amenable number.

171680856 is an abundant number, since it is smaller than the sum of its proper divisors (257521344).

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

171680856 is a wasteful number, since it uses less digits than its factorization.

171680856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153378 (or 7153374 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 42.

The square root of 171680856 is about 13102.7041483810. The cubic root of 171680856 is about 555.7855995808.

The spelling of 171680856 in words is "one hundred seventy-one million, six hundred eighty thousand, eight hundred fifty-six".