218670609 has 16 divisors (see below), whose sum is σ = 315893952. Its totient is φ = 134012928.

The previous prime is 218670607. The next prime is 218670667. The reversal of 218670609 is 906076812.

It is not a de Polignac number, because 218670609 - 2¹ = 218670607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218670607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47664 + ... + 52049.

It is an arithmetic number, because the mean of its divisors is an integer number (19743372).

Almost surely, 2^218670609 is an apocalyptic number.

It is an amenable number.

218670609 is a deficient number, since it is larger than the sum of its proper divisors (97223343).

218670609 is a wasteful number, since it uses less digits than its factorization.

218670609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99776.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 218670609 is about 14787.5153085297. The cubic root of 218670609 is about 602.4626644220.

The spelling of 218670609 in words is "two hundred eighteen million, six hundred seventy thousand, six hundred nine".