28128344 has 16 divisors (see below), whose sum is σ = 52860600. Its totient is φ = 14032192.

The previous prime is 28128343. The next prime is 28128349. The reversal of 28128344 is 44382182.

It is a self number, because there is not a number n which added to its sum of digits gives 28128344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128343) 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, 29 + ... + 7500.

Almost surely, 2^28128344 is an apocalyptic number.

It is an amenable number.

28128344 is a deficient number, since it is larger than the sum of its proper divisors (24732256).

28128344 is a wasteful number, since it uses less digits than its factorization.

28128344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8002 (or 7998 counting only the distinct ones).

The product of its digits is 12288, while the sum is 32.

The square root of 28128344 is about 5303.6161248718. The cubic root of 28128344 is about 304.1221519727.

The spelling of 28128344 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred forty-four".