22581072 has 80 divisors (see below), whose sum is σ = 65412480. Its totient is φ = 7458048.

The previous prime is 22581071. The next prime is 22581079. The reversal of 22581072 is 27018522.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22581071) 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, 71988 + ... + 72300.

It is an arithmetic number, because the mean of its divisors is an integer number (817656).

Almost surely, 2^22581072 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 22581072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32706240).

22581072 is an abundant number, since it is smaller than the sum of its proper divisors (42831408).

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

22581072 is a wasteful number, since it uses less digits than its factorization.

22581072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 22581072 is about 4751.9545452371. The cubic root of 22581072 is about 282.6494763289.

Adding to 22581072 its reverse (27018522), we get a palindrome (49599594).

The spelling of 22581072 in words is "twenty-two million, five hundred eighty-one thousand, seventy-two".