228522636 has 72 divisors (see below), whose sum is σ = 615311424. Its totient is φ = 71262720.

The previous prime is 228522629. The next prime is 228522649. The reversal of 228522636 is 636225822.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 228522636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109741 + ... + 111803.

It is an arithmetic number, because the mean of its divisors is an integer number (8545992).

Almost surely, 2^228522636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228522636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (307655712).

228522636 is an abundant number, since it is smaller than the sum of its proper divisors (386788788).

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

228522636 is a wasteful number, since it uses less digits than its factorization.

228522636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271 (or 2266 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 228522636 is about 15116.9651716209. The cubic root of 228522636 is about 611.3779081692.

The spelling of 228522636 in words is "two hundred twenty-eight million, five hundred twenty-two thousand, six hundred thirty-six".