228117918 has 64 divisors (see below), whose sum is σ = 533537280. Its totient is φ = 63676800.

The previous prime is 228117899. The next prime is 228117937. The reversal of 228117918 is 819711822.

It is an interprime number because it is at equal distance from previous prime (228117899) and next prime (228117937).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 689013 + ... + 689343.

It is an arithmetic number, because the mean of its divisors is an integer number (8336520).

Almost surely, 2^228117918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228117918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (266768640).

228117918 is an abundant number, since it is smaller than the sum of its proper divisors (305419362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228117918 is a wasteful number, since it uses less digits than its factorization.

228117918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673.

The product of its digits is 16128, while the sum is 39.

The square root of 228117918 is about 15103.5730209775. The cubic root of 228117918 is about 611.0167742008.

The spelling of 228117918 in words is "two hundred twenty-eight million, one hundred seventeen thousand, nine hundred eighteen".