228191236 has 81 divisors (see below), whose sum is σ = 509147541. Its totient is φ = 89185824.

The previous prime is 228191209. The next prime is 228191237. The reversal of 228191236 is 632191822.

The square root of 228191236 is 15106.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 33756100 + 194435136 = 5810^2 + 13944^2 .

It is not an unprimeable number, because it can be changed into a prime (228191237) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 2749251 + ... + 2749333.

Almost surely, 2^228191236 is an apocalyptic number.

228191236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

228191236 is the 15106-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228191236

228191236 is an abundant number, since it is smaller than the sum of its proper divisors (280956305).

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

228191236 is a wasteful number, since it uses less digits than its factorization.

228191236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 105 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The cubic root of 228191236 is about 611.0822282572.

The spelling of 228191236 in words is "two hundred twenty-eight million, one hundred ninety-one thousand, two hundred thirty-six".