228185721892 has 12 divisors (see below), whose sum is σ = 409064648076. Its totient is φ = 111310108160.

The previous prime is 228185721853. The next prime is 228185721893. The reversal of 228185721892 is 298127581822.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 107044134976 + 121141586916 = 327176^2 + 348054^2 .

It is not an unprimeable number, because it can be changed into a prime (228185721893) 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 3 ways as a sum of consecutive naturals, for example, 695688013 + ... + 695688340.

It is an arithmetic number, because the mean of its divisors is an integer number (34088720673).

Almost surely, 2^228185721892 is an apocalyptic number.

It is an amenable number.

228185721892 is a deficient number, since it is larger than the sum of its proper divisors (180878926184).

228185721892 is a wasteful number, since it uses less digits than its factorization.

228185721892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391376398 (or 1391376396 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 55.

The spelling of 228185721892 in words is "two hundred twenty-eight billion, one hundred eighty-five million, seven hundred twenty-one thousand, eight hundred ninety-two".