228138218 has 48 divisors (see below), whose sum is σ = 436238784. Its totient is φ = 88740960.

The previous prime is 228138217. The next prime is 228138233. The reversal of 228138218 is 812831822.

It is not an unprimeable number, because it can be changed into a prime (228138217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 369446 + ... + 370062.

It is an arithmetic number, because the mean of its divisors is an integer number (9088308).

Almost surely, 2^228138218 is an apocalyptic number.

228138218 is a deficient number, since it is larger than the sum of its proper divisors (208100566).

228138218 is an frugal number, since it uses more digits than its factorization.

228138218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 637 counting only the distinct ones).

The product of its digits is 12288, while the sum is 35.

The square root of 228138218 is about 15104.2450324404. The cubic root of 228138218 is about 611.0348982668.

The spelling of 228138218 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, two hundred eighteen".