55806228 has 18 divisors (see below), whose sum is σ = 141065834. Its totient is φ = 18602064.

The previous prime is 55806209. The next prime is 55806229. The reversal of 55806228 is 82260855.

It can be written as a sum of positive squares in only one way, i.e., 43401744 + 12404484 = 6588^2 + 3522^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×55806228² = 6228670167175968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1550173 = 55806228 / (5 + 5 + 8 + 0 + 6 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 55806192 and 55806201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55806229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 775051 + ... + 775122.

Almost surely, 2^55806228 is an apocalyptic number.

It is an amenable number.

55806228 is an abundant number, since it is smaller than the sum of its proper divisors (85259606).

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

55806228 is a wasteful number, since it uses less digits than its factorization.

55806228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550183 (or 1550178 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 55806228 is about 7470.3566179935. The cubic root of 55806228 is about 382.1444498160.

The spelling of 55806228 in words is "fifty-five million, eight hundred six thousand, two hundred twenty-eight".