228138730 has 8 divisors (see below), whose sum is σ = 410649732. Its totient is φ = 91255488.

The previous prime is 228138721. The next prime is 228138739. The reversal of 228138730 is 37831822.

It is an interprime number because it is at equal distance from previous prime (228138721) and next prime (228138739).

It can be written as a sum of positive squares in 2 ways, for example, as 226291849 + 1846881 = 15043^2 + 1359^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (228138739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11406927 + ... + 11406946.

Almost surely, 2^228138730 is an apocalyptic number.

228138730 is a deficient number, since it is larger than the sum of its proper divisors (182511002).

228138730 is a wasteful number, since it uses less digits than its factorization.

228138730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22813880.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 228138730 is about 15104.2619813085. The cubic root of 228138730 is about 611.0353553722.

The spelling of 228138730 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, seven hundred thirty".