22287744 has 64 divisors (see below), whose sum is σ = 65790000. Its totient is φ = 7428096.

The previous prime is 22287739. The next prime is 22287757. The reversal of 22287744 is 44778222.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22287699 and 22287708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232 + ... + 6680.

Almost surely, 2^22287744 is an apocalyptic number.

22287744 is a gapful number since it is divisible by the number (24) 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 22287744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32895000).

22287744 is an abundant number, since it is smaller than the sum of its proper divisors (43502256).

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

22287744 is an equidigital number, since it uses as much as digits as its factorization.

22287744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6472 (or 6454 counting only the distinct ones).

The product of its digits is 50176, while the sum is 36.

The square root of 22287744 is about 4720.9897267416. The cubic root of 22287744 is about 281.4202666788.

The spelling of 22287744 in words is "twenty-two million, two hundred eighty-seven thousand, seven hundred forty-four".