228523638 has 32 divisors (see below), whose sum is σ = 531198720. Its totient is φ = 64185120.

The previous prime is 228523637. The next prime is 228523643. The reversal of 228523638 is 836325822.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 228523596 and 228523605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228523637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43633 + ... + 48588.

It is an arithmetic number, because the mean of its divisors is an integer number (16599960).

Almost surely, 2^228523638 is an apocalyptic number.

228523638 is an abundant number, since it is smaller than the sum of its proper divisors (302675082).

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

228523638 is a wasteful number, since it uses less digits than its factorization.

228523638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92292.

The product of its digits is 138240, while the sum is 39.

The square root of 228523638 is about 15116.9983131573. The cubic root of 228523638 is about 611.3788017346.

The spelling of 228523638 in words is "two hundred twenty-eight million, five hundred twenty-three thousand, six hundred thirty-eight".