28026013 has 4 divisors (see below), whose sum is σ = 29674620. Its totient is φ = 26377408.

The previous prime is 28025999. The next prime is 28026017. The reversal of 28026013 is 31062082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25826724 + 2199289 = 5082^2 + 1483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28026013 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 (28026017) 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, 824278 + ... + 824311.

It is an arithmetic number, because the mean of its divisors is an integer number (7418655).

Almost surely, 2^28026013 is an apocalyptic number.

It is an amenable number.

28026013 is a deficient number, since it is larger than the sum of its proper divisors (1648607).

28026013 is a wasteful number, since it uses less digits than its factorization.

28026013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648606.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 28026013 is about 5293.9600489615. The cubic root of 28026013 is about 303.7529047349.

Adding to 28026013 its reverse (31062082), we get a palindrome (59088095).

The spelling of 28026013 in words is "twenty-eight million, twenty-six thousand, thirteen".