28665648 has 60 divisors (see below), whose sum is σ = 87521928. Its totient is φ = 8686080.

The previous prime is 28665647. The next prime is 28665671. The reversal of 28665648 is 84656682.

28665648 is a `hidden beast` number, since 2 + 86 + 6 + 564 + 8 = 666.

It is a super-3 number, since 3×28665648³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28665643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7465 + ... + 10632.

Almost surely, 2^28665648 is an apocalyptic number.

It is an amenable number.

28665648 is an abundant number, since it is smaller than the sum of its proper divisors (58856280).

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

28665648 is a wasteful number, since it uses less digits than its factorization.

28665648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18122 (or 18113 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 28665648 is about 5354.0310047664. The cubic root of 28665648 is about 306.0463853814.

The spelling of 28665648 in words is "twenty-eight million, six hundred sixty-five thousand, six hundred forty-eight".