22778713 has 2 divisors, whose sum is σ = 22778714. Its totient is φ = 22778712.

The previous prime is 22778687. The next prime is 22778719. The reversal of 22778713 is 31787722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21233664 + 1545049 = 4608^2 + 1243^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22778713 is a prime.

It is not a weakly prime, because it can be changed into another prime (22778719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11389356 + 11389357.

It is an arithmetic number, because the mean of its divisors is an integer number (11389357).

Almost surely, 2^22778713 is an apocalyptic number.

It is an amenable number.

22778713 is a deficient number, since it is larger than the sum of its proper divisors (1).

22778713 is an equidigital number, since it uses as much as digits as its factorization.

22778713 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32928, while the sum is 37.

The square root of 22778713 is about 4772.7049982164. The cubic root of 22778713 is about 283.4717126432.

Subtracting 22778713 from its reverse (31787722), we obtain a palindrome (9009009).

The spelling of 22778713 in words is "twenty-two million, seven hundred seventy-eight thousand, seven hundred thirteen".