28656047 has 8 divisors (see below), whose sum is σ = 34473600. Its totient is φ = 23269464.

The previous prime is 28656013. The next prime is 28656049. The reversal of 28656047 is 74065682.

It is a happy number.

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 28656047 - 2⁶ = 28655983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28656047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28656049) 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, 107597 + ... + 107862.

It is an arithmetic number, because the mean of its divisors is an integer number (4309200).

Almost surely, 2^28656047 is an apocalyptic number.

28656047 is a deficient number, since it is larger than the sum of its proper divisors (5817553).

28656047 is a wasteful number, since it uses less digits than its factorization.

28656047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215485.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 28656047 is about 5353.1343155202. The cubic root of 28656047 is about 306.0122134758.

The spelling of 28656047 in words is "twenty-eight million, six hundred fifty-six thousand, forty-seven".