28267493 has 2 divisors, whose sum is σ = 28267494. Its totient is φ = 28267492.

The previous prime is 28267487. The next prime is 28267511. The reversal of 28267493 is 39476282.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20638849 + 7628644 = 4543^2 + 2762^2 .

It is a cyclic number.

It is not a de Polignac number, because 28267493 - 2⁶ = 28267429 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28267493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28267433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14133746 + 14133747.

It is an arithmetic number, because the mean of its divisors is an integer number (14133747).

Almost surely, 2^28267493 is an apocalyptic number.

It is an amenable number.

28267493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28267493 is an equidigital number, since it uses as much as digits as its factorization.

28267493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 28267493 is about 5316.7182547131. The cubic root of 28267493 is about 304.6228178085.

The spelling of 28267493 in words is "twenty-eight million, two hundred sixty-seven thousand, four hundred ninety-three".