228121725 has 48 divisors (see below), whose sum is σ = 430097472. Its totient is φ = 105692160.

The previous prime is 228121711. The next prime is 228121727. The reversal of 228121725 is 527121822.

It is not a de Polignac number, because 228121725 - 2⁵ = 228121693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 228121692 and 228121701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228121727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9694 + ... + 23456.

It is an arithmetic number, because the mean of its divisors is an integer number (8960364).

Almost surely, 2^228121725 is an apocalyptic number.

228121725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228121725 is a deficient number, since it is larger than the sum of its proper divisors (201975747).

228121725 is a wasteful number, since it uses less digits than its factorization.

228121725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13806 (or 13801 counting only the distinct ones).

The product of its digits is 4480, while the sum is 30.

The square root of 228121725 is about 15103.6990502327. The cubic root of 228121725 is about 611.0201732147.

The spelling of 228121725 in words is "two hundred twenty-eight million, one hundred twenty-one thousand, seven hundred twenty-five".