228138732 has 36 divisors (see below), whose sum is σ = 577285800. Its totient is φ = 75966912.

The previous prime is 228138721. The next prime is 228138739. The reversal of 228138732 is 237831822.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 39144 + ... + 44592.

Almost surely, 2^228138732 is an apocalyptic number.

It is an amenable number.

228138732 is an abundant number, since it is smaller than the sum of its proper divisors (349147068).

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

228138732 is a wasteful number, since it uses less digits than its factorization.

228138732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6622 (or 6617 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 228138732 is about 15104.2620475149. The cubic root of 228138732 is about 611.0353571578.

The spelling of 228138732 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, seven hundred thirty-two".