28669493 has 2 divisors, whose sum is σ = 28669494. Its totient is φ = 28669492.

The previous prime is 28669453. The next prime is 28669517. The reversal of 28669493 is 39496682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28654609 + 14884 = 5353^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 28669493 - 2¹⁰ = 28668469 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28669453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14334746 + 14334747.

It is an arithmetic number, because the mean of its divisors is an integer number (14334747).

Almost surely, 2^28669493 is an apocalyptic number.

It is an amenable number.

28669493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28669493 is an equidigital number, since it uses as much as digits as its factorization.

28669493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 47.

The square root of 28669493 is about 5354.3900679723. The cubic root of 28669493 is about 306.0600683763.

The spelling of 28669493 in words is "twenty-eight million, six hundred sixty-nine thousand, four hundred ninety-three".