22278719 has 2 divisors, whose sum is σ = 22278720. Its totient is φ = 22278718.

The previous prime is 22278689. The next prime is 22278731. The reversal of 22278719 is 91787222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22278719 - 2¹⁶ = 22213183 is a prime.

It is a super-2 number, since 2×22278719² = 992682640561922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22278749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11139359 + 11139360.

It is an arithmetic number, because the mean of its divisors is an integer number (11139360).

Almost surely, 2^22278719 is an apocalyptic number.

22278719 is a deficient number, since it is larger than the sum of its proper divisors (1).

22278719 is an equidigital number, since it uses as much as digits as its factorization.

22278719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 22278719 is about 4720.0337922519. The cubic root of 22278719 is about 281.3822762807.

The spelling of 22278719 in words is "twenty-two million, two hundred seventy-eight thousand, seven hundred nineteen".