22878509 has 2 divisors, whose sum is σ = 22878510. Its totient is φ = 22878508.

The previous prime is 22878497. The next prime is 22878523. The reversal of 22878509 is 90587822.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18966025 + 3912484 = 4355^2 + 1978^2 .

It is a cyclic number.

It is not a de Polignac number, because 22878509 - 2²⁰ = 21829933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22878529) 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 as a sum of consecutive naturals, namely, 11439254 + 11439255.

It is an arithmetic number, because the mean of its divisors is an integer number (11439255).

Almost surely, 2^22878509 is an apocalyptic number.

It is an amenable number.

22878509 is a deficient number, since it is larger than the sum of its proper divisors (1).

22878509 is an equidigital number, since it uses as much as digits as its factorization.

22878509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 22878509 is about 4783.1484400968. The cubic root of 22878509 is about 283.8850829451.

The spelling of 22878509 in words is "twenty-two million, eight hundred seventy-eight thousand, five hundred nine".