228488138 has 4 divisors (see below), whose sum is σ = 342732210. Its totient is φ = 114244068.

The previous prime is 228488137. The next prime is 228488171. The reversal of 228488138 is 831884822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831884822 = 2 ⋅415942411.

It can be written as a sum of positive squares in only one way, i.e., 195804049 + 32684089 = 13993^2 + 5717^2 .

It is not an unprimeable number, because it can be changed into a prime (228488131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57122033 + ... + 57122036.

Almost surely, 2^228488138 is an apocalyptic number.

228488138 is a deficient number, since it is larger than the sum of its proper divisors (114244072).

228488138 is a wasteful number, since it uses less digits than its factorization.

228488138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114244071.

The product of its digits is 196608, while the sum is 44.

The square root of 228488138 is about 15115.8240926520. The cubic root of 228488138 is about 611.3471418859.

The spelling of 228488138 in words is "two hundred twenty-eight million, four hundred eighty-eight thousand, one hundred thirty-eight".