42644224 has 72 divisors (see below), whose sum is σ = 99338400. Its totient is φ = 17891328.

The previous prime is 42644219. The next prime is 42644237. The reversal of 42644224 is 42244624.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 42644192 and 42644201.

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, 94752 + ... + 95200.

It is an arithmetic number, because the mean of its divisors is an integer number (1379700).

Almost surely, 2^42644224 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 42644224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49669200).

42644224 is an abundant number, since it is smaller than the sum of its proper divisors (56694176).

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

42644224 is an equidigital number, since it uses as much as digits as its factorization.

42644224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 511 counting only the distinct ones).

The product of its digits is 12288, while the sum is 28.

The square root of 42644224 is about 6530.2545126511. The cubic root of 42644224 is about 349.3709080393.

Adding to 42644224 its reverse (42244624), we get a palindrome (84888848).

The spelling of 42644224 in words is "forty-two million, six hundred forty-four thousand, two hundred twenty-four".