22688749 has 2 divisors, whose sum is σ = 22688750. Its totient is φ = 22688748.

The previous prime is 22688723. The next prime is 22688789. The reversal of 22688749 is 94788622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22155849 + 532900 = 4707^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 22688749 - 2¹⁵ = 22655981 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22688699 and 22688708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22688719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11344374 + 11344375.

It is an arithmetic number, because the mean of its divisors is an integer number (11344375).

Almost surely, 2^22688749 is an apocalyptic number.

It is an amenable number.

22688749 is a deficient number, since it is larger than the sum of its proper divisors (1).

22688749 is an equidigital number, since it uses as much as digits as its factorization.

22688749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 22688749 is about 4763.2708300075. The cubic root of 22688749 is about 283.0980319392.

Adding to 22688749 its product of digits (387072), we get a triangular number (23075821 = T₆₇₉₃).

The spelling of 22688749 in words is "twenty-two million, six hundred eighty-eight thousand, seven hundred forty-nine".