28647728 has 10 divisors (see below), whose sum is σ = 55505004. Its totient is φ = 14323856.

The previous prime is 28647727. The next prime is 28647733. The reversal of 28647728 is 82774682.

It is not an unprimeable number, because it can be changed into a prime (28647721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895226 + ... + 895257.

Almost surely, 2^28647728 is an apocalyptic number.

It is an amenable number.

28647728 is a deficient number, since it is larger than the sum of its proper divisors (26857276).

28647728 is a wasteful number, since it uses less digits than its factorization.

28647728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790491 (or 1790485 counting only the distinct ones).

The product of its digits is 301056, while the sum is 44.

The square root of 28647728 is about 5352.3572377038. The cubic root of 28647728 is about 305.9825982956.

The spelling of 28647728 in words is "twenty-eight million, six hundred forty-seven thousand, seven hundred twenty-eight".