55424220 has 96 divisors (see below), whose sum is σ = 163840320. Its totient is φ = 13977600.

The previous prime is 55424219. The next prime is 55424231. The reversal of 55424220 is 2242455.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91920 + ... + 92520.

It is an arithmetic number, because the mean of its divisors is an integer number (1706670).

Almost surely, 2^55424220 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 55424220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81920160).

55424220 is an abundant number, since it is smaller than the sum of its proper divisors (108416100).

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

55424220 is a wasteful number, since it uses less digits than its factorization.

55424220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 55424220 is about 7444.7444549830. The cubic root of 55424220 is about 381.2704935683.

Adding to 55424220 its reverse (2242455), we get a palindrome (57666675).

The spelling of 55424220 in words is "fifty-five million, four hundred twenty-four thousand, two hundred twenty".