28008645 has 48 divisors (see below), whose sum is σ = 53187840. Its totient is φ = 12544896.

The previous prime is 28008637. The next prime is 28008661. The reversal of 28008645 is 54680082.

It is not a de Polignac number, because 28008645 - 2³ = 28008637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38596 + ... + 39314.

It is an arithmetic number, because the mean of its divisors is an integer number (1108080).

Almost surely, 2^28008645 is an apocalyptic number.

It is an amenable number.

28008645 is a deficient number, since it is larger than the sum of its proper divisors (25179195).

28008645 is a wasteful number, since it uses less digits than its factorization.

28008645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 28008645 is about 5292.3194348036. The cubic root of 28008645 is about 303.6901455333.

The spelling of 28008645 in words is "twenty-eight million, eight thousand, six hundred forty-five".