228724138 has 16 divisors (see below), whose sum is σ = 362393856. Its totient is φ = 108097920.

The previous prime is 228724129. The next prime is 228724193. The reversal of 228724138 is 831427822.

It is a junction number, because it is equal to n+sod(n) for n = 228724097 and 228724106.

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, 40231 + ... + 45562.

It is an arithmetic number, because the mean of its divisors is an integer number (22649616).

Almost surely, 2^228724138 is an apocalyptic number.

228724138 is a deficient number, since it is larger than the sum of its proper divisors (133669718).

228724138 is a wasteful number, since it uses less digits than its factorization.

228724138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85869.

The product of its digits is 43008, while the sum is 37.

The square root of 228724138 is about 15123.6284667404. The cubic root of 228724138 is about 611.5575514670.

The spelling of 228724138 in words is "two hundred twenty-eight million, seven hundred twenty-four thousand, one hundred thirty-eight".