28744728 has 16 divisors (see below), whose sum is σ = 71861880. Its totient is φ = 9581568.

The previous prime is 28744721. The next prime is 28744747. The reversal of 28744728 is 82744782.

It is a self number, because there is not a number n which added to its sum of digits gives 28744728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28744721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 598825 + ... + 598872.

Almost surely, 2^28744728 is an apocalyptic number.

It is an amenable number.

28744728 is an abundant number, since it is smaller than the sum of its proper divisors (43117152).

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

28744728 is a wasteful number, since it uses less digits than its factorization.

28744728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197706 (or 1197702 counting only the distinct ones).

The product of its digits is 200704, while the sum is 42.

The square root of 28744728 is about 5361.4110083074. The cubic root of 28744728 is about 306.3275573111.

The spelling of 28744728 in words is "twenty-eight million, seven hundred forty-four thousand, seven hundred twenty-eight".