55228840 has 16 divisors (see below), whose sum is σ = 124264980. Its totient is φ = 22091520.

The previous prime is 55228829. The next prime is 55228843. The reversal of 55228840 is 4882255.

55228840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 54730404 + 498436 = 7398^2 + 706^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55228796 and 55228805.

It is not an unprimeable number, because it can be changed into a prime (55228843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690321 + ... + 690400.

Almost surely, 2^55228840 is an apocalyptic number.

It is an amenable number.

55228840 is an abundant number, since it is smaller than the sum of its proper divisors (69036140).

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

55228840 is a wasteful number, since it uses less digits than its factorization.

55228840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380732 (or 1380728 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 55228840 is about 7431.6108617177. The cubic root of 55228840 is about 380.8219511921.

It can be divided in two parts, 552 and 28840, that added together give a palindrome (29392).

The spelling of 55228840 in words is "fifty-five million, two hundred twenty-eight thousand, eight hundred forty".