169897728 has 432 divisors, whose sum is σ = 646361856. Its totient is φ = 38338560.

The previous prime is 169897681. The next prime is 169897771. The reversal of 169897728 is 827798961.

169897728 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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9993976 + ... + 9993992.

It is an arithmetic number, because the mean of its divisors is an integer number (1496208).

Almost surely, 2^169897728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 169897728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323180928).

169897728 is an abundant number, since it is smaller than the sum of its proper divisors (476464128).

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

169897728 is a wasteful number, since it uses less digits than its factorization.

169897728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 53 counting only the distinct ones).

The product of its digits is 3048192, while the sum is 57.

The square root of 169897728 is about 13034.4822681992. The cubic root of 169897728 is about 553.8547147775.

The spelling of 169897728 in words is "one hundred sixty-nine million, eight hundred ninety-seven thousand, seven hundred twenty-eight".