22628281 has 8 divisors (see below), whose sum is σ = 24474240. Its totient is φ = 20797392.

The previous prime is 22628267. The next prime is 22628299. The reversal of 22628281 is 18282622.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22628281 - 2⁹ = 22627769 is a prime.

It is a super-2 number, since 2×22628281² = 1024078202029922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22628231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535 + ... + 6748.

It is an arithmetic number, because the mean of its divisors is an integer number (3059280).

Almost surely, 2^22628281 is an apocalyptic number.

It is an amenable number.

22628281 is a deficient number, since it is larger than the sum of its proper divisors (1845959).

22628281 is a wasteful number, since it uses less digits than its factorization.

22628281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7535.

The product of its digits is 6144, while the sum is 31.

The square root of 22628281 is about 4756.9192761702. The cubic root of 22628281 is about 282.8463124373.

The spelling of 22628281 in words is "twenty-two million, six hundred twenty-eight thousand, two hundred eighty-one".