28160389 has 2 divisors, whose sum is σ = 28160390. Its totient is φ = 28160388.

The previous prime is 28160383. The next prime is 28160393. The reversal of 28160389 is 98306182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25704900 + 2455489 = 5070^2 + 1567^2 .

It is a cyclic number.

It is not a de Polignac number, because 28160389 - 2⁵ = 28160357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28160383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14080194 + 14080195.

It is an arithmetic number, because the mean of its divisors is an integer number (14080195).

Almost surely, 2^28160389 is an apocalyptic number.

It is an amenable number.

28160389 is a deficient number, since it is larger than the sum of its proper divisors (1).

28160389 is an equidigital number, since it uses as much as digits as its factorization.

28160389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28160389 is about 5306.6363169149. The cubic root of 28160389 is about 304.2375977527.

The spelling of 28160389 in words is "twenty-eight million, one hundred sixty thousand, three hundred eighty-nine".