4478728 has 8 divisors (see below), whose sum is σ = 8397630. Its totient is φ = 2239360.

The previous prime is 4478707. The next prime is 4478741. The reversal of 4478728 is 8278744.

It is a happy number.

4478728 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3392964 + 1085764 = 1842^2 + 1042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a d-powerful number, because it can be written as 4⁹ + 4¹¹ + 7⁴ + 8³ + 7⁵ + 2¹¹ + 8³ .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 279913 + ... + 279928.

Almost surely, 2^4478728 is an apocalyptic number.

It is an amenable number.

4478728 is a deficient number, since it is larger than the sum of its proper divisors (3918902).

4478728 is a wasteful number, since it uses less digits than its factorization.

4478728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559847 (or 559843 counting only the distinct ones).

The product of its digits is 100352, while the sum is 40.

The square root of 4478728 is about 2116.3005457638. The cubic root of 4478728 is about 164.8358085069.

The spelling of 4478728 in words is "four million, four hundred seventy-eight thousand, seven hundred twenty-eight".