228138524 has 12 divisors (see below), whose sum is σ = 400240848. Its totient is φ = 113784000.

The previous prime is 228138523. The next prime is 228138539. The reversal of 228138524 is 425831822.

228138524 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×228138524² = 104094372265797152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228138523) 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, 69512 + ... + 72719.

It is an arithmetic number, because the mean of its divisors is an integer number (33353404).

Almost surely, 2^228138524 is an apocalyptic number.

It is an amenable number.

228138524 is a deficient number, since it is larger than the sum of its proper divisors (172102324).

228138524 is a wasteful number, since it uses less digits than its factorization.

228138524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142636 (or 142634 counting only the distinct ones).

The product of its digits is 30720, while the sum is 35.

The square root of 228138524 is about 15104.2551620396. The cubic root of 228138524 is about 611.0351714588.

The spelling of 228138524 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, five hundred twenty-four".