22728493 has 2 divisors, whose sum is σ = 22728494. Its totient is φ = 22728492.

The previous prime is 22728491. The next prime is 22728521. The reversal of 22728493 is 39482722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12981609 + 9746884 = 3603^2 + 3122^2 .

It is a cyclic number.

It is not a de Polignac number, because 22728493 - 2¹ = 22728491 is a prime.

Together with 22728491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22728491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11364246 + 11364247.

It is an arithmetic number, because the mean of its divisors is an integer number (11364247).

Almost surely, 2^22728493 is an apocalyptic number.

It is an amenable number.

22728493 is a deficient number, since it is larger than the sum of its proper divisors (1).

22728493 is an equidigital number, since it uses as much as digits as its factorization.

22728493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 37.

The square root of 22728493 is about 4767.4409277934. The cubic root of 22728493 is about 283.2632369465.

The spelling of 22728493 in words is "twenty-two million, seven hundred twenty-eight thousand, four hundred ninety-three".