228521136 has 40 divisors (see below), whose sum is σ = 596444464. Its totient is φ = 75386880.

The previous prime is 228521129. The next prime is 228521159. The reversal of 228521136 is 631125822.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19885 + ... + 29196.

Almost surely, 2^228521136 is an apocalyptic number.

It is an amenable number.

228521136 is an abundant number, since it is smaller than the sum of its proper divisors (367923328).

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

228521136 is a wasteful number, since it uses less digits than its factorization.

228521136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49189 (or 49183 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 228521136 is about 15116.9155584067. The cubic root of 228521136 is about 611.3765704915.

Adding to 228521136 its reverse (631125822), we get a palindrome (859646958).

The spelling of 228521136 in words is "two hundred twenty-eight million, five hundred twenty-one thousand, one hundred thirty-six".