55044220 has 96 divisors (see below), whose sum is σ = 148893696. Its totient is φ = 16588800.

The previous prime is 55044217. The next prime is 55044229. The reversal of 55044220 is 2244055.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 55044191 and 55044200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55044229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47164 + ... + 48316.

It is an arithmetic number, because the mean of its divisors is an integer number (1550976).

Almost surely, 2^55044220 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 55044220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74446848).

55044220 is an abundant number, since it is smaller than the sum of its proper divisors (93849476).

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

55044220 is a wasteful number, since it uses less digits than its factorization.

55044220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1211 (or 1209 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 55044220 is about 7419.1791998846. The cubic root of 55044220 is about 380.3971379000.

Adding to 55044220 its reverse (2244055), we get a palindrome (57288275).

The spelling of 55044220 in words is "fifty-five million, forty-four thousand, two hundred twenty".