55447218 has 12 divisors (see below), whose sum is σ = 120135678. Its totient is φ = 18482400.

The previous prime is 55447193. The next prime is 55447229. The reversal of 55447218 is 81274455.

55447218 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 only one way, i.e., 31505769 + 23941449 = 5613^2 + 4893^2 .

It is a Curzon number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1540183 + ... + 1540218.

Almost surely, 2^55447218 is an apocalyptic number.

55447218 is an abundant number, since it is smaller than the sum of its proper divisors (64688460).

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

55447218 is a wasteful number, since it uses less digits than its factorization.

55447218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080409 (or 3080406 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 55447218 is about 7446.2888743320. The cubic root of 55447218 is about 381.3232216974.

The spelling of 55447218 in words is "fifty-five million, four hundred forty-seven thousand, two hundred eighteen".