55444224 has 72 divisors (see below), whose sum is σ = 161001792. Its totient is φ = 16798720.

The previous prime is 55444217. The next prime is 55444273. The reversal of 55444224 is 42244455.

It is a junction number, because it is equal to n+sod(n) for n = 55444191 and 55444200.

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, 5167 + ... + 11729.

It is an arithmetic number, because the mean of its divisors is an integer number (2236136).

Almost surely, 2^55444224 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 55444224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80500896).

55444224 is an abundant number, since it is smaller than the sum of its proper divisors (105557568).

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

55444224 is a wasteful number, since it uses less digits than its factorization.

55444224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593 (or 6579 counting only the distinct ones).

The product of its digits is 25600, while the sum is 30.

The square root of 55444224 is about 7446.0878318752. The cubic root of 55444224 is about 381.3163580992.

Adding to 55444224 its reverse (42244455), we get a palindrome (97688679).

The spelling of 55444224 in words is "fifty-five million, four hundred forty-four thousand, two hundred twenty-four".