28456291 has 8 divisors (see below), whose sum is σ = 29139264. Its totient is φ = 27776640.

The previous prime is 28456289. The next prime is 28456321. The reversal of 28456291 is 19265482.

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 28456291 - 2¹ = 28456289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28456291.

It is not an unprimeable number, because it can be changed into a prime (28456261) 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 7 ways as a sum of consecutive naturals, for example, 27361 + ... + 28381.

It is an arithmetic number, because the mean of its divisors is an integer number (3642408).

Almost surely, 2^28456291 is an apocalyptic number.

28456291 is a deficient number, since it is larger than the sum of its proper divisors (682973).

28456291 is a wasteful number, since it uses less digits than its factorization.

28456291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661.

The product of its digits is 34560, while the sum is 37.

The square root of 28456291 is about 5334.4438323034. The cubic root of 28456291 is about 305.2995033434.

The spelling of 28456291 in words is "twenty-eight million, four hundred fifty-six thousand, two hundred ninety-one".