228138636 has 24 divisors (see below), whose sum is σ = 580716864. Its totient is φ = 69132880.

The previous prime is 228138629. The next prime is 228138653. The reversal of 228138636 is 636831822.

228138636 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 228138594 and 228138603.

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, 864030 + ... + 864293.

It is an arithmetic number, because the mean of its divisors is an integer number (24196536).

Almost surely, 2^228138636 is an apocalyptic number.

It is an amenable number.

228138636 is an abundant number, since it is smaller than the sum of its proper divisors (352578228).

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

228138636 is a wasteful number, since it uses less digits than its factorization.

228138636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728341 (or 1728339 counting only the distinct ones).

The product of its digits is 82944, while the sum is 39.

The square root of 228138636 is about 15104.2588696036. The cubic root of 228138636 is about 611.0352714505.

The spelling of 228138636 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, six hundred thirty-six".