728870172 has 96 divisors (see below), whose sum is σ = 1936327680. Its totient is φ = 211968000.

The previous prime is 728870159. The next prime is 728870173. The reversal of 728870172 is 271078827.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728870173) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 180172 + ... + 184172.

It is an arithmetic number, because the mean of its divisors is an integer number (20170080).

Almost surely, 2^728870172 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 728870172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (968163840).

728870172 is an abundant number, since it is smaller than the sum of its proper divisors (1207457508).

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

728870172 is a wasteful number, since it uses less digits than its factorization.

728870172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091 (or 4089 counting only the distinct ones).

The product of its (nonzero) digits is 87808, while the sum is 42.

The square root of 728870172 is about 26997.5956707259. The cubic root of 728870172 is about 899.9465696676.

The spelling of 728870172 in words is "seven hundred twenty-eight million, eight hundred seventy thousand, one hundred seventy-two".