22778645 has 16 divisors (see below), whose sum is σ = 28408320. Its totient is φ = 17515200.

The previous prime is 22778629. The next prime is 22778647. The reversal of 22778645 is 54687722.

It is not a de Polignac number, because 22778645 - 2⁴ = 22778629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22778647) 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 in 15 ways as a sum of consecutive naturals, for example, 27335 + ... + 28155.

It is an arithmetic number, because the mean of its divisors is an integer number (1775520).

Almost surely, 2^22778645 is an apocalyptic number.

It is an amenable number.

22778645 is a deficient number, since it is larger than the sum of its proper divisors (5629675).

22778645 is a wasteful number, since it uses less digits than its factorization.

22778645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036.

The product of its digits is 188160, while the sum is 41.

The square root of 22778645 is about 4772.6978743683. The cubic root of 22778645 is about 283.4714305656.

The spelling of 22778645 in words is "twenty-two million, seven hundred seventy-eight thousand, six hundred forty-five".