170720 has 48 divisors (see below), whose sum is σ = 444528. Its totient is φ = 61440.

The previous prime is 170711. The next prime is 170741. The reversal of 170720 is 27071.

It is a happy number.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712 + ... + 1808.

It is an arithmetic number, because the mean of its divisors is an integer number (9261).

2¹⁷⁰⁷²⁰ is an apocalyptic number.

170720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 170720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (222264).

170720 is an abundant number, since it is smaller than the sum of its proper divisors (273808).

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

170720 is a wasteful number, since it uses less digits than its factorization.

170720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 17.

The square root of 170720 is about 413.1827682757. The cubic root of 170720 is about 55.4746793569.

Adding to 170720 its reverse (27071), we get a palindrome (197791).

The spelling of 170720 in words is "one hundred seventy thousand, seven hundred twenty", and thus it is an iban number.