170728845 has 16 divisors (see below), whose sum is σ = 312190080. Its totient is φ = 78047424.

The previous prime is 170728843. The next prime is 170728861. The reversal of 170728845 is 548827071.

170728845 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 170728845 - 2¹ = 170728843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 170728797 and 170728806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170728843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 812890 + ... + 813099.

It is an arithmetic number, because the mean of its divisors is an integer number (19511880).

Almost surely, 2^170728845 is an apocalyptic number.

170728845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

170728845 is a deficient number, since it is larger than the sum of its proper divisors (141461235).

170728845 is a wasteful number, since it uses less digits than its factorization.

170728845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626004.

The product of its (nonzero) digits is 125440, while the sum is 42.

The square root of 170728845 is about 13066.3248467195. The cubic root of 170728845 is about 554.7563738772.

The spelling of 170728845 in words is "one hundred seventy million, seven hundred twenty-eight thousand, eight hundred forty-five".