55224840 has 256 divisors, whose sum is σ = 201553920. Its totient is φ = 11939840.

The previous prime is 55224833. The next prime is 55224847. The reversal of 55224840 is 4842255.

It is an interprime number because it is at equal distance from previous prime (55224833) and next prime (55224847).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55224798 and 55224807.

It is not an unprimeable number, because it can be changed into a prime (55224847) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 516067 + ... + 516173.

It is an arithmetic number, because the mean of its divisors is an integer number (787320).

Almost surely, 2^55224840 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 55224840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100776960).

55224840 is an abundant number, since it is smaller than the sum of its proper divisors (146329080).

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

55224840 is a wasteful number, since it uses less digits than its factorization.

55224840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

The square root of 55224840 is about 7431.3417361873. The cubic root of 55224840 is about 380.8127571757.

The spelling of 55224840 in words is "fifty-five million, two hundred twenty-four thousand, eight hundred forty".