55218286 has 4 divisors (see below), whose sum is σ = 82827432. Its totient is φ = 27609142.

The previous prime is 55218283. The next prime is 55218287. The reversal of 55218286 is 68281255.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55218283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13804570 + ... + 13804573.

It is an arithmetic number, because the mean of its divisors is an integer number (20706858).

Almost surely, 2^55218286 is an apocalyptic number.

55218286 is a deficient number, since it is larger than the sum of its proper divisors (27609146).

55218286 is a wasteful number, since it uses less digits than its factorization.

55218286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27609145.

The product of its digits is 38400, while the sum is 37.

The square root of 55218286 is about 7430.9007529370. The cubic root of 55218286 is about 380.7976918201.

The spelling of 55218286 in words is "fifty-five million, two hundred eighteen thousand, two hundred eighty-six".