22491136 has 78 divisors (see below), whose sum is σ = 50292740. Its totient is φ = 10027008.

The previous prime is 22491097. The next prime is 22491137. The reversal of 22491136 is 63119422.

It is not an unprimeable number, because it can be changed into a prime (22491137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183735 + ... + 1183753.

Almost surely, 2^22491136 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 22491136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25146370).

22491136 is an abundant number, since it is smaller than the sum of its proper divisors (27801604).

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

22491136 is an equidigital number, since it uses as much as digits as its factorization.

22491136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77 (or 38 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 22491136 is about 4742.4820505723. The cubic root of 22491136 is about 282.2737311578.

The spelling of 22491136 in words is "twenty-two million, four hundred ninety-one thousand, one hundred thirty-six".