218828506 has 8 divisors (see below), whose sum is σ = 353492244. Its totient is φ = 100997760.

The previous prime is 218828503. The next prime is 218828513. The reversal of 218828506 is 605828812.

It is a happy number.

218828506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 213422881 + 5405625 = 14609^2 + 2325^2 .

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

It is not an unprimeable number, because it can be changed into a prime (218828501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4208215 + ... + 4208266.

Almost surely, 2^218828506 is an apocalyptic number.

218828506 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

218828506 is a deficient number, since it is larger than the sum of its proper divisors (134663738).

218828506 is a wasteful number, since it uses less digits than its factorization.

218828506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8416496.

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 218828506 is about 14792.8532068699. The cubic root of 218828506 is about 602.6076376622.

The spelling of 218828506 in words is "two hundred eighteen million, eight hundred twenty-eight thousand, five hundred six".