22808281 has 4 divisors (see below), whose sum is σ = 23544064. Its totient is φ = 22072500.

The previous prime is 22808273. The next prime is 22808299. The reversal of 22808281 is 18280822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 22808281 - 2³ = 22808273 is a prime.

It is a super-2 number, since 2×22808281² = 1040435364349922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 735751 = 22808281 / (2 + 2 + 8 + 0 + 8 + 2 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22808221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367845 + ... + 367906.

It is an arithmetic number, because the mean of its divisors is an integer number (5886016).

Almost surely, 2^22808281 is an apocalyptic number.

It is an amenable number.

22808281 is a deficient number, since it is larger than the sum of its proper divisors (735783).

22808281 is an equidigital number, since it uses as much as digits as its factorization.

22808281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735782.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 22808281 is about 4775.8016081073. The cubic root of 22808281 is about 283.5943134765.

The spelling of 22808281 in words is "twenty-two million, eight hundred eight thousand, two hundred eighty-one".