228136728 has 32 divisors (see below), whose sum is σ = 570754800. Its totient is φ = 75990528.

The previous prime is 228136697. The next prime is 228136739. The reversal of 228136728 is 827631822.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 43428 + ... + 48396.

Almost surely, 2^228136728 is an apocalyptic number.

It is an amenable number.

228136728 is an abundant number, since it is smaller than the sum of its proper divisors (342618072).

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

228136728 is a wasteful number, since it uses less digits than its factorization.

228136728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6891 (or 6887 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 228136728 is about 15104.1957084778. The cubic root of 228136728 is about 611.0335680148.

The spelling of 228136728 in words is "two hundred twenty-eight million, one hundred thirty-six thousand, seven hundred twenty-eight".