55007218 has 16 divisors (see below), whose sum is σ = 94397760. Its totient is φ = 23549616.

The previous prime is 55007207. The next prime is 55007219. The reversal of 55007218 is 81270055.

It is not an unprimeable number, because it can be changed into a prime (55007219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19080 + ... + 21772.

It is an arithmetic number, because the mean of its divisors is an integer number (5899860).

Almost surely, 2^55007218 is an apocalyptic number.

55007218 is a deficient number, since it is larger than the sum of its proper divisors (39390542).

55007218 is a wasteful number, since it uses less digits than its factorization.

55007218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4161.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 55007218 is about 7416.6851085913. The cubic root of 55007218 is about 380.3118815368.

It can be divided in two parts, 55007 and 218, that added together give a square (55225 = 235²).

The spelling of 55007218 in words is "fifty-five million, seven thousand, two hundred eighteen".