218616012 has 36 divisors (see below), whose sum is σ = 576641520. Its totient is φ = 69703392.

The previous prime is 218616011. The next prime is 218616019. The reversal of 218616012 is 210616812.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (218616011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131187 + ... + 132842.

It is an arithmetic number, because the mean of its divisors is an integer number (16017820).

Almost surely, 2^218616012 is an apocalyptic number.

It is an amenable number.

218616012 is an abundant number, since it is smaller than the sum of its proper divisors (358025508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218616012 is a wasteful number, since it uses less digits than its factorization.

218616012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264062 (or 264057 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 218616012 is about 14785.6691427882. The cubic root of 218616012 is about 602.4125199114.

The spelling of 218616012 in words is "two hundred eighteen million, six hundred sixteen thousand, twelve".