22778407 has 2 divisors, whose sum is σ = 22778408. Its totient is φ = 22778406.

The previous prime is 22778389. The next prime is 22778423. The reversal of 22778407 is 70487722.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22778407 - 2¹⁹ = 22254119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22778477) 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, 11389203 + 11389204.

It is an arithmetic number, because the mean of its divisors is an integer number (11389204).

Almost surely, 2^22778407 is an apocalyptic number.

22778407 is a deficient number, since it is larger than the sum of its proper divisors (1).

22778407 is an equidigital number, since it uses as much as digits as its factorization.

22778407 is an odious number, because the sum of its binary digits is odd.

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

The square root of 22778407 is about 4772.6729408163. The cubic root of 22778407 is about 283.4704432895.

The spelling of 22778407 in words is "twenty-two million, seven hundred seventy-eight thousand, four hundred seven".