28509248 has 28 divisors (see below), whose sum is σ = 56796432. Its totient is φ = 14198400.

The previous prime is 28509209. The next prime is 28509251. The reversal of 28509248 is 84290582.

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, 18923 + ... + 20373.

It is an arithmetic number, because the mean of its divisors is an integer number (2028444).

Almost surely, 2^28509248 is an apocalyptic number.

It is an amenable number.

28509248 is a deficient number, since it is larger than the sum of its proper divisors (28287184).

28509248 is a wasteful number, since it uses less digits than its factorization.

28509248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 28509248 is about 5339.4052103207. The cubic root of 28509248 is about 305.4887728772.

The spelling of 28509248 in words is "twenty-eight million, five hundred nine thousand, two hundred forty-eight".