28281623 has 2 divisors, whose sum is σ = 28281624. Its totient is φ = 28281622.

The previous prime is 28281601. The next prime is 28281629. The reversal of 28281623 is 32618282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28281623 - 2¹⁰ = 28280599 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28281623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28281629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14140811 + 14140812.

It is an arithmetic number, because the mean of its divisors is an integer number (14140812).

Almost surely, 2^28281623 is an apocalyptic number.

28281623 is a deficient number, since it is larger than the sum of its proper divisors (1).

28281623 is an equidigital number, since it uses as much as digits as its factorization.

28281623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 32.

The square root of 28281623 is about 5318.0469159269. The cubic root of 28281623 is about 304.6735663652.

The spelling of 28281623 in words is "twenty-eight million, two hundred eighty-one thousand, six hundred twenty-three".