22778409 has 16 divisors (see below), whose sum is σ = 31456512. Its totient is φ = 14652288.

The previous prime is 22778407. The next prime is 22778423. The reversal of 22778409 is 90487722.

It is not a de Polignac number, because 22778409 - 2¹ = 22778407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22778407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9187 + ... + 11399.

It is an arithmetic number, because the mean of its divisors is an integer number (1966032).

Almost surely, 2^22778409 is an apocalyptic number.

It is an amenable number.

22778409 is a deficient number, since it is larger than the sum of its proper divisors (8678103).

22778409 is a wasteful number, since it uses less digits than its factorization.

22778409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 22778409 is about 4772.6731503425. The cubic root of 22778409 is about 283.4704515860.

The spelling of 22778409 in words is "twenty-two million, seven hundred seventy-eight thousand, four hundred nine".