28020648 has 32 divisors (see below), whose sum is σ = 71544960. Its totient is φ = 9141120.

The previous prime is 28020631. The next prime is 28020659. The reversal of 28020648 is 84602082.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11293 + ... + 13548.

It is an arithmetic number, because the mean of its divisors is an integer number (2235780).

Almost surely, 2^28020648 is an apocalyptic number.

It is an amenable number.

28020648 is an abundant number, since it is smaller than the sum of its proper divisors (43524312).

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

28020648 is a wasteful number, since it uses less digits than its factorization.

28020648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24897 (or 24893 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28020648 is about 5293.4533151809. The cubic root of 28020648 is about 303.7335210962.

The spelling of 28020648 in words is "twenty-eight million, twenty thousand, six hundred forty-eight".