55307218 has 8 divisors (see below), whose sum is σ = 82999548. Its totient is φ = 27640704.

The previous prime is 55307201. The next prime is 55307243. The reversal of 55307218 is 81270355.

It can be written as a sum of positive squares in 2 ways, for example, as 44983849 + 10323369 = 6707^2 + 3213^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 55307218.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330 + ... + 10522.

Almost surely, 2^55307218 is an apocalyptic number.

55307218 is a deficient number, since it is larger than the sum of its proper divisors (27692330).

55307218 is a wasteful number, since it uses less digits than its factorization.

55307218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12908.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55307218 is about 7436.8822768684. The cubic root of 55307218 is about 381.0020138452.

The spelling of 55307218 in words is "fifty-five million, three hundred seven thousand, two hundred eighteen".