9161728 has 44 divisors (see below), whose sum is σ = 19159920. Its totient is φ = 4370432.

The previous prime is 9161723. The next prime is 9161729. The reversal of 9161728 is 8271619.

It is a happy number.

Its product of digits (6048) is a multiple of the sum of its prime factors (432).

It is a junction number, because it is equal to n+sod(n) for n = 9161693 and 9161702.

It is not an unprimeable number, because it can be changed into a prime (9161723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23358 + ... + 23746.

Almost surely, 2^9161728 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 9161728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9579960).

9161728 is an abundant number, since it is smaller than the sum of its proper divisors (9998192).

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

9161728 is a wasteful number, since it uses less digits than its factorization.

9161728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 414 counting only the distinct ones).

The product of its digits is 6048, while the sum is 34.

The square root of 9161728 is about 3026.8346502576. The cubic root of 9161728 is about 209.2469475557.

It can be divided in two parts, 9161 and 728, that added together give a palindrome (9889).

The spelling of 9161728 in words is "nine million, one hundred sixty-one thousand, seven hundred twenty-eight".