28056913 has 4 divisors (see below), whose sum is σ = 28067508. Its totient is φ = 28046320.

The previous prime is 28056907. The next prime is 28056943. The reversal of 28056913 is 31965082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 25725184 + 2331729 = 5072^2 + 1527^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056913 - 2¹³ = 28048721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056943) 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, 2595 + ... + 7927.

It is an arithmetic number, because the mean of its divisors is an integer number (7016877).

Almost surely, 2^28056913 is an apocalyptic number.

It is an amenable number.

28056913 is a deficient number, since it is larger than the sum of its proper divisors (10595).

28056913 is an equidigital number, since it uses as much as digits as its factorization.

28056913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10594.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 28056913 is about 5296.8776651911. The cubic root of 28056913 is about 303.8644976965.

The spelling of 28056913 in words is "twenty-eight million, fifty-six thousand, nine hundred thirteen".