22708729 has 2 divisors, whose sum is σ = 22708730. Its totient is φ = 22708728.

The previous prime is 22708727. The next prime is 22708747. The reversal of 22708729 is 92780722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21409129 + 1299600 = 4627^2 + 1140^2 .

It is a cyclic number.

It is not a de Polignac number, because 22708729 - 2¹ = 22708727 is a prime.

Together with 22708727, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22708727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11354364 + 11354365.

It is an arithmetic number, because the mean of its divisors is an integer number (11354365).

Almost surely, 2^22708729 is an apocalyptic number.

It is an amenable number.

22708729 is a deficient number, since it is larger than the sum of its proper divisors (1).

22708729 is an equidigital number, since it uses as much as digits as its factorization.

22708729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 22708729 is about 4765.3676668228. The cubic root of 22708729 is about 283.1811074635.

The spelling of 22708729 in words is "twenty-two million, seven hundred eight thousand, seven hundred twenty-nine".