170870 has 16 divisors (see below), whose sum is σ = 351648. Its totient is φ = 58560.

The previous prime is 170857. The next prime is 170873. The reversal of 170870 is 78071.

170870 = 80² + 81² + ... + 100².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170873) by changing a digit.

170870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1151 + ... + 1290.

It is an arithmetic number, because the mean of its divisors is an integer number (21978).

2¹⁷⁰⁸⁷⁰ is an apocalyptic number.

170870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

170870 is an abundant number, since it is smaller than the sum of its proper divisors (180778).

It is a weird number, because it is abundant, but not a pseudoperfect number.

170870 is a wasteful number, since it uses less digits than its factorization.

170870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 170870 is about 413.3642461559. The cubic root of 170870 is about 55.4909218710.

The spelling of 170870 in words is "one hundred seventy thousand, eight hundred seventy".