171664878 has 96 divisors (see below), whose sum is σ = 456890112. Its totient is φ = 41944320.

The previous prime is 171664873. The next prime is 171664897. The reversal of 171664878 is 878466171.

171664878 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171664873) 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 47 ways as a sum of consecutive naturals, for example, 85401 + ... + 87387.

It is an arithmetic number, because the mean of its divisors is an integer number (4759272).

Almost surely, 2^171664878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171664878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228445056).

171664878 is an abundant number, since it is smaller than the sum of its proper divisors (285225234).

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

171664878 is a wasteful number, since it uses less digits than its factorization.

171664878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038 (or 2027 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 171664878 is about 13102.0944127265. The cubic root of 171664878 is about 555.7683570879.

The spelling of 171664878 in words is "one hundred seventy-one million, six hundred sixty-four thousand, eight hundred seventy-eight".