228081388 has 12 divisors (see below), whose sum is σ = 400019032. Its totient is φ = 113790240.

The previous prime is 228081383. The next prime is 228081397. The reversal of 228081388 is 883180822.

It is a super-2 number, since 2×228081388² = 104042239104013088, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 228081388.

It is not an unprimeable number, because it can be changed into a prime (228081383) 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, 60558 + ... + 64213.

Almost surely, 2^228081388 is an apocalyptic number.

It is an amenable number.

228081388 is a deficient number, since it is larger than the sum of its proper divisors (171937644).

228081388 is a wasteful number, since it uses less digits than its factorization.

228081388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125232 (or 125230 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 40.

The square root of 228081388 is about 15102.3636560639. The cubic root of 228081388 is about 610.9841571016.

The spelling of 228081388 in words is "two hundred twenty-eight million, eighty-one thousand, three hundred eighty-eight".