28194539 has 4 divisors (see below), whose sum is σ = 28226400. Its totient is φ = 28162680.

The previous prime is 28194533. The next prime is 28194553. The reversal of 28194539 is 93549182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93549182 = 2 ⋅46774591.

It is a cyclic number.

It is not a de Polignac number, because 28194539 - 2¹² = 28190443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28194496 and 28194505.

It is not an unprimeable number, because it can be changed into a prime (28194533) 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, 14564 + ... + 16385.

It is an arithmetic number, because the mean of its divisors is an integer number (7056600).

Almost surely, 2^28194539 is an apocalyptic number.

28194539 is a deficient number, since it is larger than the sum of its proper divisors (31861).

28194539 is an equidigital number, since it uses as much as digits as its factorization.

28194539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31860.

The product of its digits is 77760, while the sum is 41.

The square root of 28194539 is about 5309.8530111482. The cubic root of 28194539 is about 304.3605306773.

The spelling of 28194539 in words is "twenty-eight million, one hundred ninety-four thousand, five hundred thirty-nine".