22778 has 8 divisors (see below), whose sum is σ = 39072.
Its totient is φ = 9756.
The previous prime is 22777. The next prime is 22783. The reversal of 22778 is 87722.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a Curzon number.
It is a plaindrome in base 10 and base 12.
It is a nialpdrome in base 14.
It is a zygodrome in base 12.
It is not an unprimeable number, because it can be changed into a prime (22777) 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, 800 + ... + 827.
It is an arithmetic number, because the mean of its divisors is an integer number (4884).
222778 is an apocalyptic number.
22778 is a deficient number, since it is larger than the sum of its proper divisors (16294).
22778 is a wasteful number, since it uses less digits than its factorization.
22778 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1636.
The product of its digits is 1568, while the sum is 26.
The square root of 22778 is about 150.9238218440.
The cubic root of 22778 is about 28.3468754948.
The spelling of 22778 in words is "twenty-two thousand, seven hundred seventy-eight".