22778647 has 2 divisors, whose sum is σ = 22778648. Its totient is φ = 22778646.

The previous prime is 22778629. The next prime is 22778677. The reversal of 22778647 is 74687722.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22778647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22778627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11389323 + 11389324.

It is an arithmetic number, because the mean of its divisors is an integer number (11389324).

Almost surely, 2^22778647 is an apocalyptic number.

22778647 is a deficient number, since it is larger than the sum of its proper divisors (1).

22778647 is an equidigital number, since it uses as much as digits as its factorization.

22778647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 263424, while the sum is 43.

The square root of 22778647 is about 4772.6980838934. The cubic root of 22778647 is about 283.4714388620.

The spelling of 22778647 in words is "twenty-two million, seven hundred seventy-eight thousand, six hundred forty-seven".