22928281 has 4 divisors (see below), whose sum is σ = 23142672. Its totient is φ = 22713892.

The previous prime is 22928273. The next prime is 22928303. The reversal of 22928281 is 18282922.

It is a happy number.

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 22928281 - 2³ = 22928273 is a prime.

It is a super-2 number, since 2×22928281² = 1051412139229922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22928201) 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, 107035 + ... + 107248.

It is an arithmetic number, because the mean of its divisors is an integer number (5785668).

Almost surely, 2^22928281 is an apocalyptic number.

It is an amenable number.

22928281 is a deficient number, since it is larger than the sum of its proper divisors (214391).

22928281 is a wasteful number, since it uses less digits than its factorization.

22928281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214390.

The product of its digits is 9216, while the sum is 34.

The square root of 22928281 is about 4788.3484626748. The cubic root of 22928281 is about 284.0907970280.

The spelling of 22928281 in words is "twenty-two million, nine hundred twenty-eight thousand, two hundred eighty-one".