22491612 has 144 divisors (see below), whose sum is σ = 70997472. Its totient is φ = 5898240.

The previous prime is 22491563. The next prime is 22491613. The reversal of 22491612 is 21619422.

22491612 is a `hidden beast` number, since 2 + 2 + 49 + 1 + 612 = 666.

It is a super-2 number, since 2×22491612² = 1011745220717088, which contains 22 as substring.

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 (22491613) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87388 + ... + 87644.

It is an arithmetic number, because the mean of its divisors is an integer number (493038).

Almost surely, 2^22491612 is an apocalyptic number.

22491612 is a gapful number since it is divisible by the number (22) 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 22491612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35498736).

22491612 is an abundant number, since it is smaller than the sum of its proper divisors (48505860).

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

22491612 is a wasteful number, since it uses less digits than its factorization.

22491612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 303 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 22491612 is about 4742.5322349985. The cubic root of 22491612 is about 282.2757224807.

The spelling of 22491612 in words is "twenty-two million, four hundred ninety-one thousand, six hundred twelve".