28006728 has 16 divisors (see below), whose sum is σ = 70016880. Its totient is φ = 9335568.

The previous prime is 28006697. The next prime is 28006753. The reversal of 28006728 is 82760082.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 583450 + ... + 583497.

It is an arithmetic number, because the mean of its divisors is an integer number (4376055).

Almost surely, 2^28006728 is an apocalyptic number.

It is an amenable number.

28006728 is an abundant number, since it is smaller than the sum of its proper divisors (42010152).

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

28006728 is a wasteful number, since it uses less digits than its factorization.

28006728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166956 (or 1166952 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 28006728 is about 5292.1383201878. The cubic root of 28006728 is about 303.6832168714.

The spelling of 28006728 in words is "twenty-eight million, six thousand, seven hundred twenty-eight".