28086013 has 4 divisors (see below), whose sum is σ = 29307168. Its totient is φ = 26864860.

The previous prime is 28085987. The next prime is 28086017. The reversal of 28086013 is 31068082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28086013 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 (28086017) 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, 610543 + ... + 610588.

It is an arithmetic number, because the mean of its divisors is an integer number (7326792).

Almost surely, 2^28086013 is an apocalyptic number.

28086013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28086013 is a deficient number, since it is larger than the sum of its proper divisors (1221155).

28086013 is a wasteful number, since it uses less digits than its factorization.

28086013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221154.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 28086013 is about 5299.6238545769. The cubic root of 28086013 is about 303.9695152084.

The spelling of 28086013 in words is "twenty-eight million, eighty-six thousand, thirteen".