22388256 has 144 divisors (see below), whose sum is σ = 71705088. Its totient is φ = 6566400.

The previous prime is 22388243. The next prime is 22388257. The reversal of 22388256 is 65288322.

22388256 is a `hidden beast` number, since 22 + 388 + 256 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 22388256.

It is not an unprimeable number, because it can be changed into a prime (22388257) 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 23 ways as a sum of consecutive naturals, for example, 117121 + ... + 117311.

It is an arithmetic number, because the mean of its divisors is an integer number (497952).

Almost surely, 2^22388256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22388256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35852544).

22388256 is an abundant number, since it is smaller than the sum of its proper divisors (49316832).

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

22388256 is a wasteful number, since it uses less digits than its factorization.

22388256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 244 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 22388256 is about 4731.6229773726. The cubic root of 22388256 is about 281.8426766966.

The spelling of 22388256 in words is "twenty-two million, three hundred eighty-eight thousand, two hundred fifty-six".