28256413 has 2 divisors, whose sum is σ = 28256414. Its totient is φ = 28256412.

The previous prime is 28256399. The next prime is 28256471. The reversal of 28256413 is 31465282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21921124 + 6335289 = 4682^2 + 2517^2 .

It is a cyclic number.

It is not a de Polignac number, because 28256413 - 2⁵ = 28256381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28256713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14128206 + 14128207.

It is an arithmetic number, because the mean of its divisors is an integer number (14128207).

Almost surely, 2^28256413 is an apocalyptic number.

It is an amenable number.

28256413 is a deficient number, since it is larger than the sum of its proper divisors (1).

28256413 is an equidigital number, since it uses as much as digits as its factorization.

28256413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 31.

The square root of 28256413 is about 5315.6761564264. The cubic root of 28256413 is about 304.5830116383.

The spelling of 28256413 in words is "twenty-eight million, two hundred fifty-six thousand, four hundred thirteen".