4321728 has 112 divisors (see below), whose sum is σ = 13228320. Its totient is φ = 1382400.

The previous prime is 4321717. The next prime is 4321729. The reversal of 4321728 is 8271234.

4321728 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4321729) 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, 70818 + ... + 70878.

It is an arithmetic number, because the mean of its divisors is an integer number (118110).

Almost surely, 2^4321728 is an apocalyptic number.

4321728 is a gapful number since it is divisible by the number (48) 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 4321728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6614160).

4321728 is an abundant number, since it is smaller than the sum of its proper divisors (8906592).

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

4321728 is a wasteful number, since it uses less digits than its factorization.

4321728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 107 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 4321728 is about 2078.8766197156. The cubic root of 4321728 is about 162.8867694419.

It can be divided in two parts, 432 and 1728, that multiplied together give a square (746496 = 864²).

The spelling of 4321728 in words is "four million, three hundred twenty-one thousand, seven hundred twenty-eight".