228138625 has 32 divisors (see below), whose sum is σ = 334518912. Its totient is φ = 153144000.

The previous prime is 228138619. The next prime is 228138629. The reversal of 228138625 is 526831822.

It is a de Polignac number, because none of the positive numbers 2^k-228138625 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228138629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11494 + ... + 24256.

It is an arithmetic number, because the mean of its divisors is an integer number (10453716).

Almost surely, 2^228138625 is an apocalyptic number.

228138625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228138625 is a deficient number, since it is larger than the sum of its proper divisors (106380287).

228138625 is a wasteful number, since it uses less digits than its factorization.

228138625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12802 (or 12792 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 228138625 is about 15104.2585054679. The cubic root of 228138625 is about 611.0352616299.

The spelling of 228138625 in words is "two hundred twenty-eight million, one hundred thirty-eight thousand, six hundred twenty-five".