28139759 has 4 divisors (see below), whose sum is σ = 28794216. Its totient is φ = 27485304.

The previous prime is 28139747. The next prime is 28139789. The reversal of 28139759 is 95793182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95793182 = 2 ⋅47896591.

It is a cyclic number.

It is not a de Polignac number, because 28139759 - 2¹⁶ = 28074223 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 (28139719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327164 + ... + 327249.

It is an arithmetic number, because the mean of its divisors is an integer number (7198554).

Almost surely, 2^28139759 is an apocalyptic number.

28139759 is a deficient number, since it is larger than the sum of its proper divisors (654457).

28139759 is an equidigital number, since it uses as much as digits as its factorization.

28139759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654456.

The product of its digits is 136080, while the sum is 44.

The square root of 28139759 is about 5304.6921682601. The cubic root of 28139759 is about 304.1632858656.

The spelling of 28139759 in words is "twenty-eight million, one hundred thirty-nine thousand, seven hundred fifty-nine".