22565478 has 32 divisors (see below), whose sum is σ = 48787200. Its totient is φ = 6916896.

The previous prime is 22565467. The next prime is 22565479. The reversal of 22565478 is 87456522.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22565479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33913 + ... + 34571.

It is an arithmetic number, because the mean of its divisors is an integer number (1524600).

Almost surely, 2^22565478 is an apocalyptic number.

22565478 is an abundant number, since it is smaller than the sum of its proper divisors (26221722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22565478 is a wasteful number, since it uses less digits than its factorization.

22565478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116.

The product of its digits is 134400, while the sum is 39.

The square root of 22565478 is about 4750.3134633411. The cubic root of 22565478 is about 282.5843974739.

It can be divided in two parts, 225 and 65478, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 22565478 in words is "twenty-two million, five hundred sixty-five thousand, four hundred seventy-eight".