22778665 has 24 divisors (see below), whose sum is σ = 33835968. Its totient is φ = 14414400.

The previous prime is 22778647. The next prime is 22778677. The reversal of 22778665 is 56687722.

It is not a de Polignac number, because 22778665 - 2⁷ = 22778537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 3990 + ... + 7840.

It is an arithmetic number, because the mean of its divisors is an integer number (1409832).

Almost surely, 2^22778665 is an apocalyptic number.

It is an amenable number.

22778665 is a deficient number, since it is larger than the sum of its proper divisors (11057303).

22778665 is a wasteful number, since it uses less digits than its factorization.

22778665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3889 (or 3876 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The square root of 22778665 is about 4772.6999696189. The cubic root of 22778665 is about 283.4715135297.

The spelling of 22778665 in words is "twenty-two million, seven hundred seventy-eight thousand, six hundred sixty-five".