228138644 has 12 divisors (see below), whose sum is σ = 400171968. Its totient is φ = 113803800.

The previous prime is 228138629. The next prime is 228138653. The reversal of 228138644 is 446831822.

228138644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 228138598 and 228138607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64442 + ... + 67889.

It is an arithmetic number, because the mean of its divisors is an integer number (33347664).

Almost surely, 2^228138644 is an apocalyptic number.

It is an amenable number.

228138644 is a deficient number, since it is larger than the sum of its proper divisors (172033324).

228138644 is a wasteful number, since it uses less digits than its factorization.

228138644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132766 (or 132764 counting only the distinct ones).

The product of its digits is 73728, while the sum is 38.

The square root of 228138644 is about 15104.2591344296. The cubic root of 228138644 is about 611.0352785928.

The spelling of 228138644 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, six hundred forty-four".