28855747 has 4 divisors (see below), whose sum is σ = 28870240. Its totient is φ = 28841256.

The previous prime is 28855741. The next prime is 28855751. The reversal of 28855747 is 74755882.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28855747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28855697 and 28855706.

It is not an unprimeable number, because it can be changed into a prime (28855741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3672 + ... + 8437.

It is an arithmetic number, because the mean of its divisors is an integer number (7217560).

Almost surely, 2^28855747 is an apocalyptic number.

28855747 is a deficient number, since it is larger than the sum of its proper divisors (14493).

28855747 is a wasteful number, since it uses less digits than its factorization.

28855747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14492.

The product of its digits is 627200, while the sum is 46.

The square root of 28855747 is about 5371.7545550779. The cubic root of 28855747 is about 306.7214207264.

The spelling of 28855747 in words is "twenty-eight million, eight hundred fifty-five thousand, seven hundred forty-seven".