22251744 has 36 divisors (see below), whose sum is σ = 63279216. Its totient is φ = 7417152.

The previous prime is 22251743. The next prime is 22251751. The reversal of 22251744 is 44715222.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×22251744² = 990280222083072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22251743) 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, 38344 + ... + 38919.

It is an arithmetic number, because the mean of its divisors is an integer number (1757756).

Almost surely, 2^22251744 is an apocalyptic number.

22251744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22251744 is an abundant number, since it is smaller than the sum of its proper divisors (41027472).

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

22251744 is a wasteful number, since it uses less digits than its factorization.

22251744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77279 (or 77268 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 22251744 is about 4717.1754260362. The cubic root of 22251744 is about 281.2686648354.

Adding to 22251744 its reverse (44715222), we get a palindrome (66966966).

It can be divided in two parts, 2225 and 1744, that added together give a square (3969 = 63²).

The spelling of 22251744 in words is "twenty-two million, two hundred fifty-one thousand, seven hundred forty-four".