28081759 has 4 divisors (see below), whose sum is σ = 28224504. Its totient is φ = 27939016.

The previous prime is 28081747. The next prime is 28081769. The reversal of 28081759 is 95718082.

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

It is a cyclic number.

It is not a de Polignac number, because 28081759 - 2⁵ = 28081727 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71077 + ... + 71470.

It is an arithmetic number, because the mean of its divisors is an integer number (7056126).

Almost surely, 2^28081759 is an apocalyptic number.

28081759 is a deficient number, since it is larger than the sum of its proper divisors (142745).

28081759 is a wasteful number, since it uses less digits than its factorization.

28081759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142744.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28081759 is about 5299.2224901395. Note that the first 3 decimals coincide. The cubic root of 28081759 is about 303.9541676923.

The spelling of 28081759 in words is "twenty-eight million, eighty-one thousand, seven hundred fifty-nine".