55433218 has 4 divisors (see below), whose sum is σ = 83149830. Its totient is φ = 27716608.

The previous prime is 55433171. The next prime is 55433221. The reversal of 55433218 is 81233455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55398249 + 34969 = 7443^2 + 187^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55433218.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 13858303 + ... + 13858306.

Almost surely, 2^55433218 is an apocalyptic number.

55433218 is a deficient number, since it is larger than the sum of its proper divisors (27716612).

55433218 is a wasteful number, since it uses less digits than its factorization.

55433218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27716611.

The product of its digits is 14400, while the sum is 31.

The square root of 55433218 is about 7445.3487493871. The cubic root of 55433218 is about 381.2911252600.

The spelling of 55433218 in words is "fifty-five million, four hundred thirty-three thousand, two hundred eighteen".