228181536 has 240 divisors, whose sum is σ = 750835008. Its totient is φ = 67392000.

The previous prime is 228181529. The next prime is 228181537. The reversal of 228181536 is 635181822.

It is a happy number.

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 228181536.

It is not an unprimeable number, because it can be changed into a prime (228181537) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1511061 + ... + 1511211.

Almost surely, 2^228181536 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 228181536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375417504).

228181536 is an abundant number, since it is smaller than the sum of its proper divisors (522653472).

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

228181536 is a wasteful number, since it uses less digits than its factorization.

228181536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 220 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 228181536 is about 15105.6789321103. The cubic root of 228181536 is about 611.0735694648.

The spelling of 228181536 in words is "two hundred twenty-eight million, one hundred eighty-one thousand, five hundred thirty-six".