15428728 has 24 divisors (see below), whose sum is σ = 33652800. Its totient is φ = 6612144.

The previous prime is 15428717. The next prime is 15428729. The reversal of 15428728 is 82782451.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15428729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19288 + ... + 20071.

It is an arithmetic number, because the mean of its divisors is an integer number (1402200).

Almost surely, 2^15428728 is an apocalyptic number.

It is an amenable number.

15428728 is an abundant number, since it is smaller than the sum of its proper divisors (18224072).

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

15428728 is a wasteful number, since it uses less digits than its factorization.

15428728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39379 (or 39368 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 15428728 is about 3927.9419547646. The cubic root of 15428728 is about 248.9488021273.

It can be divided in two parts, 154 and 28728, that added together give a palindrome (28882).

The spelling of 15428728 in words is "fifteen million, four hundred twenty-eight thousand, seven hundred twenty-eight".