228117156 has 12 divisors (see below), whose sum is σ = 532273392. Its totient is φ = 76039048.

The previous prime is 228117143. The next prime is 228117163. The reversal of 228117156 is 651711822.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9504870 + ... + 9504893.

It is an arithmetic number, because the mean of its divisors is an integer number (44356116).

Almost surely, 2^228117156 is an apocalyptic number.

It is an amenable number.

228117156 is an abundant number, since it is smaller than the sum of its proper divisors (304156236).

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

228117156 is a wasteful number, since it uses less digits than its factorization.

228117156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19009770 (or 19009768 counting only the distinct ones).

The product of its digits is 6720, while the sum is 33.

The square root of 228117156 is about 15103.5477951374. The cubic root of 228117156 is about 611.0160938578.

Adding to 228117156 its reverse (651711822), we get a palindrome (879828978).

The spelling of 228117156 in words is "two hundred twenty-eight million, one hundred seventeen thousand, one hundred fifty-six".