228671218 has 4 divisors (see below), whose sum is σ = 343006830. Its totient is φ = 114335608.

The previous prime is 228671189. The next prime is 228671231. The reversal of 228671218 is 812176822.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 226412209 + 2259009 = 15047^2 + 1503^2 .

It is a super-4 number, since 4×228671218⁴ (a number of 35 digits) contains 4444 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57167803 + ... + 57167806.

Almost surely, 2^228671218 is an apocalyptic number.

228671218 is a deficient number, since it is larger than the sum of its proper divisors (114335612).

228671218 is a wasteful number, since it uses less digits than its factorization.

228671218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114335611.

The product of its digits is 21504, while the sum is 37.

The square root of 228671218 is about 15121.8787853891. The cubic root of 228671218 is about 611.5103823863.

The spelling of 228671218 in words is "two hundred twenty-eight million, six hundred seventy-one thousand, two hundred eighteen".