55018224 has 80 divisors (see below), whose sum is σ = 166259200. Its totient is φ = 17371584.

The previous prime is 55018219. The next prime is 55018237. The reversal of 55018224 is 42281055.

It is a happy number.

It is a super-2 number, since 2×55018224² = 6054009944228352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4857 + ... + 11559.

It is an arithmetic number, because the mean of its divisors is an integer number (2078240).

Almost surely, 2^55018224 is an apocalyptic number.

55018224 is a gapful number since it is divisible by the number (54) 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 55018224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83129600).

55018224 is an abundant number, since it is smaller than the sum of its proper divisors (111240976).

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

55018224 is a wasteful number, since it uses less digits than its factorization.

55018224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6739 (or 6727 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 55018224 is about 7417.4270471640. The cubic root of 55018224 is about 380.3372444715.

Adding to 55018224 its reverse (42281055), we get a palindrome (97299279).

The spelling of 55018224 in words is "fifty-five million, eighteen thousand, two hundred twenty-four".