28295728 has 20 divisors (see below), whose sum is σ = 54930760. Its totient is φ = 14120064.

The previous prime is 28295723. The next prime is 28295741. The reversal of 28295728 is 82759282.

It is not an unprimeable number, because it can be changed into a prime (28295723) 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, 8476 + ... + 11332.

It is an arithmetic number, because the mean of its divisors is an integer number (2746538).

Almost surely, 2^28295728 is an apocalyptic number.

It is an amenable number.

28295728 is a deficient number, since it is larger than the sum of its proper divisors (26635032).

28295728 is a wasteful number, since it uses less digits than its factorization.

28295728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3484 (or 3478 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 28295728 is about 5319.3728953703. The cubic root of 28295728 is about 304.7242082777.

The spelling of 28295728 in words is "twenty-eight million, two hundred ninety-five thousand, seven hundred twenty-eight".