22664281 has 4 divisors (see below), whose sum is σ = 23997492. Its totient is φ = 21331072.

The previous prime is 22664273. The next prime is 22664287. The reversal of 22664281 is 18246622.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11833600 + 10830681 = 3440^2 + 3291^2 .

It is a cyclic number.

It is not a de Polignac number, because 22664281 - 2³ = 22664273 is a prime.

It is a super-2 number, since 2×22664281² = 1027339266493922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22664287) 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 in 3 ways as a sum of consecutive naturals, for example, 666580 + ... + 666613.

It is an arithmetic number, because the mean of its divisors is an integer number (5999373).

Almost surely, 2^22664281 is an apocalyptic number.

It is an amenable number.

22664281 is a deficient number, since it is larger than the sum of its proper divisors (1333211).

22664281 is a wasteful number, since it uses less digits than its factorization.

22664281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333210.

The product of its digits is 9216, while the sum is 31.

The square root of 22664281 is about 4760.7017339884. The cubic root of 22664281 is about 282.9962291448.

The spelling of 22664281 in words is "twenty-two million, six hundred sixty-four thousand, two hundred eighty-one".