172870 has 16 divisors (see below), whose sum is σ = 317520. Its totient is φ = 67744.

The previous prime is 172867. The next prime is 172871. The reversal of 172870 is 78271.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444 + ... + 736.

It is an arithmetic number, because the mean of its divisors is an integer number (19845).

2¹⁷²⁸⁷⁰ is an apocalyptic number.

172870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

172870 is a deficient number, since it is larger than the sum of its proper divisors (144650).

172870 is a wasteful number, since it uses less digits than its factorization.

172870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 172870 is about 415.7763822056. The cubic root of 172870 is about 55.7065860810.

The spelling of 172870 in words is "one hundred seventy-two thousand, eight hundred seventy".