28280647 has 8 divisors (see below), whose sum is σ = 28962000. Its totient is φ = 27606144.

The previous prime is 28280621. The next prime is 28280669. The reversal of 28280647 is 74608282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28280647 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 (28280687) 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, 7183 + ... + 10399.

It is an arithmetic number, because the mean of its divisors is an integer number (3620250).

Almost surely, 2^28280647 is an apocalyptic number.

28280647 is a deficient number, since it is larger than the sum of its proper divisors (681353).

28280647 is a wasteful number, since it uses less digits than its factorization.

28280647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3425.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28280647 is about 5317.9551521238. The cubic root of 28280647 is about 304.6700615590.

The spelling of 28280647 in words is "twenty-eight million, two hundred eighty thousand, six hundred forty-seven".