55421344 has 48 divisors (see below), whose sum is σ = 120597120. Its totient is φ = 24860160.

The previous prime is 55421323. The next prime is 55421357. The reversal of 55421344 is 44312455.

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, 26812 + ... + 28804.

It is an arithmetic number, because the mean of its divisors is an integer number (2512440).

Almost surely, 2^55421344 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 55421344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60298560).

55421344 is an abundant number, since it is smaller than the sum of its proper divisors (65175776).

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

55421344 is a wasteful number, since it uses less digits than its factorization.

55421344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093 (or 2085 counting only the distinct ones).

The product of its digits is 9600, while the sum is 28.

The square root of 55421344 is about 7444.5512960823. The cubic root of 55421344 is about 381.2638986602.

Adding to 55421344 its reverse (44312455), we get a palindrome (99733799).

Subtracting from 55421344 its reverse (44312455), we obtain a square (11108889 = 3333²).

It can be divided in two parts, 5542 and 1344, that added together give a palindrome (6886).

The spelling of 55421344 in words is "fifty-five million, four hundred twenty-one thousand, three hundred forty-four".