9728172 has 72 divisors (see below), whose sum is σ = 26557440. Its totient is φ = 2993760.

The previous prime is 9728167. The next prime is 9728177. The reversal of 9728172 is 2718279.

It is an interprime number because it is at equal distance from previous prime (9728167) and next prime (9728177).

It is a super-3 number, since 3×9728172³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (9728177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25479 + ... + 25857.

Almost surely, 2^9728172 is an apocalyptic number.

9728172 is a gapful number since it is divisible by the number (92) 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 9728172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13278720).

9728172 is an abundant number, since it is smaller than the sum of its proper divisors (16829268).

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

9728172 is a wasteful number, since it uses less digits than its factorization.

9728172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 438 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 9728172 is about 3119.0017633852. The cubic root of 9728172 is about 213.4733900183.

The spelling of 9728172 in words is "nine million, seven hundred twenty-eight thousand, one hundred seventy-two".