55915218 has 16 divisors (see below), whose sum is σ = 124256160. Its totient is φ = 18638388.

The previous prime is 55915217. The next prime is 55915253. The reversal of 55915218 is 81251955.

It is a happy number.

55915218 is a `hidden beast` number, since 5 + 591 + 52 + 18 = 666.

55915218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55915213) 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 7 ways as a sum of consecutive naturals, for example, 517680 + ... + 517787.

It is an arithmetic number, because the mean of its divisors is an integer number (7766010).

Almost surely, 2^55915218 is an apocalyptic number.

55915218 is an abundant number, since it is smaller than the sum of its proper divisors (68340942).

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

55915218 is a wasteful number, since it uses less digits than its factorization.

55915218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035478 (or 1035472 counting only the distinct ones).

The product of its digits is 18000, while the sum is 36.

The square root of 55915218 is about 7477.6478922185. The cubic root of 55915218 is about 382.3930650706.

The spelling of 55915218 in words is "fifty-five million, nine hundred fifteen thousand, two hundred eighteen".