22638378 has 16 divisors (see below), whose sum is σ = 51744960. Its totient is φ = 6468096.

The previous prime is 22638377. The next prime is 22638389. The reversal of 22638378 is 87383622.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22638377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 269463 + ... + 269546.

It is an arithmetic number, because the mean of its divisors is an integer number (3234060).

Almost surely, 2^22638378 is an apocalyptic number.

22638378 is an abundant number, since it is smaller than the sum of its proper divisors (29106582).

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

22638378 is a wasteful number, since it uses less digits than its factorization.

22638378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539021.

The product of its digits is 96768, while the sum is 39.

The square root of 22638378 is about 4757.9804539321. The cubic root of 22638378 is about 282.8883759439. Note that the first 3 decimals are identical.

The spelling of 22638378 in words is "twenty-two million, six hundred thirty-eight thousand, three hundred seventy-eight".