22228777 has 2 divisors, whose sum is σ = 22228778. Its totient is φ = 22228776.

The previous prime is 22228747. The next prime is 22228793. The reversal of 22228777 is 77782222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15280281 + 6948496 = 3909^2 + 2636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22228777 is a prime.

It is not a weakly prime, because it can be changed into another prime (22228747) 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 as a sum of consecutive naturals, namely, 11114388 + 11114389.

It is an arithmetic number, because the mean of its divisors is an integer number (11114389).

Almost surely, 2^22228777 is an apocalyptic number.

It is an amenable number.

22228777 is a deficient number, since it is larger than the sum of its proper divisors (1).

22228777 is an equidigital number, since it uses as much as digits as its factorization.

22228777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43904, while the sum is 37.

The square root of 22228777 is about 4714.7403958224. The cubic root of 22228777 is about 281.1718616183.

It can be divided in two parts, 22228 and 777, that added together give a triangular number (23005 = T₂₁₄).

The spelling of 22228777 in words is "twenty-two million, two hundred twenty-eight thousand, seven hundred seventy-seven".