55218236 has 6 divisors (see below), whose sum is σ = 96631920. Its totient is φ = 27609116.

The previous prime is 55218217. The next prime is 55218257. The reversal of 55218236 is 63281255.

It is a congruent number.

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, 6902276 + ... + 6902283.

It is an arithmetic number, because the mean of its divisors is an integer number (16105320).

Almost surely, 2^55218236 is an apocalyptic number.

It is an amenable number.

55218236 is a deficient number, since it is larger than the sum of its proper divisors (41413684).

55218236 is a wasteful number, since it uses less digits than its factorization.

55218236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13804563 (or 13804561 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 55218236 is about 7430.8973886066. The cubic root of 55218236 is about 380.7975768830.

The spelling of 55218236 in words is "fifty-five million, two hundred eighteen thousand, two hundred thirty-six".