28640048 has 20 divisors (see below), whose sum is σ = 56012040. Its totient is φ = 14185344.

The previous prime is 28640047. The next prime is 28640069. The reversal of 28640048 is 84004682.

It is a junction number, because it is equal to n+sod(n) for n = 28639996 and 28640023.

It is not an unprimeable number, because it can be changed into a prime (28640041) 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, 6653 + ... + 10076.

It is an arithmetic number, because the mean of its divisors is an integer number (2800602).

Almost surely, 2^28640048 is an apocalyptic number.

It is an amenable number.

28640048 is a deficient number, since it is larger than the sum of its proper divisors (27371992).

28640048 is a wasteful number, since it uses less digits than its factorization.

28640048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16844 (or 16838 counting only the distinct ones).

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

The square root of 28640048 is about 5351.6397487125. The cubic root of 28640048 is about 305.9552528300.

The spelling of 28640048 in words is "twenty-eight million, six hundred forty thousand, forty-eight".