228138368 has 64 divisors (see below), whose sum is σ = 489661200. Its totient is φ = 105480192.

The previous prime is 228138343. The next prime is 228138401. The reversal of 228138368 is 863831822.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×228138368² = 104094229907406848, which contains 22 as substring.

It is a congruent number.

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, 127496 + ... + 129272.

Almost surely, 2^228138368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 228138368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244830600).

228138368 is an abundant number, since it is smaller than the sum of its proper divisors (261522832).

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

228138368 is a wasteful number, since it uses less digits than its factorization.

228138368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867 (or 1855 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 228138368 is about 15104.2499979310. The cubic root of 228138368 is about 611.0350321845.

The spelling of 228138368 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, three hundred sixty-eight".