22428643 has 2 divisors, whose sum is σ = 22428644. Its totient is φ = 22428642.

The previous prime is 22428619. The next prime is 22428709. The reversal of 22428643 is 34682422.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22428643 is a prime.

It is not a weakly prime, because it can be changed into another prime (22428613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11214321 + 11214322.

It is an arithmetic number, because the mean of its divisors is an integer number (11214322).

Almost surely, 2^22428643 is an apocalyptic number.

22428643 is a deficient number, since it is larger than the sum of its proper divisors (1).

22428643 is an equidigital number, since it uses as much as digits as its factorization.

22428643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 31.

The square root of 22428643 is about 4735.8888289317. Note that the first 4 decimals coincide. The cubic root of 22428643 is about 282.0120503544.

The spelling of 22428643 in words is "twenty-two million, four hundred twenty-eight thousand, six hundred forty-three".