218687073 has 8 divisors (see below), whose sum is σ = 318090336. Its totient is φ = 132537600.

The previous prime is 218687009. The next prime is 218687081. The reversal of 218687073 is 370786812.

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

It is not a de Polignac number, because 218687073 - 2⁶ = 218687009 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (218687003) 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, 3313408 + ... + 3313473.

It is an arithmetic number, because the mean of its divisors is an integer number (39761292).

Almost surely, 2^218687073 is an apocalyptic number.

It is an amenable number.

218687073 is a deficient number, since it is larger than the sum of its proper divisors (99403263).

218687073 is a wasteful number, since it uses less digits than its factorization.

218687073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6626895.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 218687073 is about 14788.0719838659. The cubic root of 218687073 is about 602.4777841134.

The spelling of 218687073 in words is "two hundred eighteen million, six hundred eighty-seven thousand, seventy-three".