218630769 has 8 divisors (see below), whose sum is σ = 333151680. Its totient is φ = 124931856.

The previous prime is 218630729. The next prime is 218630803. The reversal of 218630769 is 967036812.

It is a happy number.

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

It is not a de Polignac number, because 218630769 - 2⁹ = 218630257 is a prime.

It is a super-2 number, since 2×218630769² = 95598826307062722, which contains 22 as substring.

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 a self number, because there is not a number n which added to its sum of digits gives 218630769.

It is not an unprimeable number, because it can be changed into a prime (218630729) 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, 5205474 + ... + 5205515.

It is an arithmetic number, because the mean of its divisors is an integer number (41643960).

Almost surely, 2^218630769 is an apocalyptic number.

It is an amenable number.

218630769 is a deficient number, since it is larger than the sum of its proper divisors (114520911).

218630769 is a wasteful number, since it uses less digits than its factorization.

218630769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10410999.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 218630769 is about 14786.1681648763. The cubic root of 218630769 is about 602.4260742732.

The spelling of 218630769 in words is "two hundred eighteen million, six hundred thirty thousand, seven hundred sixty-nine".