28608021 has 24 divisors (see below), whose sum is σ = 46440576. Its totient is φ = 16837920.

The previous prime is 28608011. The next prime is 28608023. The reversal of 28608021 is 12080682.

It is not a de Polignac number, because 28608021 - 2¹⁹ = 28083733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28608023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2625 + ... + 8006.

It is an arithmetic number, because the mean of its divisors is an integer number (1935024).

Almost surely, 2^28608021 is an apocalyptic number.

It is an amenable number.

28608021 is a deficient number, since it is larger than the sum of its proper divisors (17832555).

28608021 is a wasteful number, since it uses less digits than its factorization.

28608021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673 (or 10670 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28608021 is about 5348.6466512567. The cubic root of 28608021 is about 305.8411645238.

The spelling of 28608021 in words is "twenty-eight million, six hundred eight thousand, twenty-one".