28805647 has 8 divisors (see below), whose sum is σ = 31860416. Its totient is φ = 25870752.

The previous prime is 28805639. The next prime is 28805677. The reversal of 28805647 is 74650882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28805647 - 2³ = 28805639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28805617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29463 + ... + 30424.

It is an arithmetic number, because the mean of its divisors is an integer number (3982552).

Almost surely, 2^28805647 is an apocalyptic number.

28805647 is a deficient number, since it is larger than the sum of its proper divisors (3054769).

28805647 is a wasteful number, since it uses less digits than its factorization.

28805647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59937.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 28805647 is about 5367.0892483729. The cubic root of 28805647 is about 306.5438056730.

The spelling of 28805647 in words is "twenty-eight million, eight hundred five thousand, six hundred forty-seven".