22381128 has 144 divisors (see below), whose sum is σ = 76352640. Its totient is φ = 5797440.

The previous prime is 22381123. The next prime is 22381133. The reversal of 22381128 is 82118322.

It is an interprime number because it is at equal distance from previous prime (22381123) and next prime (22381133).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22381123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60801 + ... + 61167.

Almost surely, 2^22381128 is an apocalyptic number.

22381128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22381128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38176320).

22381128 is an abundant number, since it is smaller than the sum of its proper divisors (53971512).

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

22381128 is a wasteful number, since it uses less digits than its factorization.

22381128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 390 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 22381128 is about 4730.8696874888. The cubic root of 22381128 is about 281.8127623844.

The spelling of 22381128 in words is "twenty-two million, three hundred eighty-one thousand, one hundred twenty-eight".