218828891 has 8 divisors (see below), whose sum is σ = 224135424. Its totient is φ = 213566080.

The previous prime is 218828881. The next prime is 218828927. The reversal of 218828891 is 198828812.

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

It is a cyclic number.

It is not a de Polignac number, because 218828891 - 2¹⁴ = 218812507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218828801) 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, 686 + ... + 20931.

It is an arithmetic number, because the mean of its divisors is an integer number (28016928).

Almost surely, 2^218828891 is an apocalyptic number.

218828891 is a deficient number, since it is larger than the sum of its proper divisors (5306533).

218828891 is a wasteful number, since it uses less digits than its factorization.

218828891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21861.

The product of its digits is 147456, while the sum is 47.

The square root of 218828891 is about 14792.8662199048. The cubic root of 218828891 is about 602.6079910649.

The spelling of 218828891 in words is "two hundred eighteen million, eight hundred twenty-eight thousand, eight hundred ninety-one".