228644641 has 3 divisors (see below), whose sum is σ = 228659763. Its totient is φ = 228629520.

The previous prime is 228644639. The next prime is 228644681. The reversal of 228644641 is 146446822.

It is a happy number.

The square root of 228644641 is 15121.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 48011041 + 180633600 = 6929^2 + 13440^2 .

It is not a de Polignac number, because 228644641 - 2¹ = 228644639 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228644641.

It is not an unprimeable number, because it can be changed into a prime (228644681) 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 2 ways as a sum of consecutive naturals, for example, 7561 + ... + 22681.

It is an arithmetic number, because the mean of its divisors is an integer number (76219921).

Almost surely, 2^228644641 is an apocalyptic number.

228644641 is the 15121-st square number.

228644641 is the 7561-st centered octagonal number.

It is an amenable number.

228644641 is a deficient number, since it is larger than the sum of its proper divisors (15122).

228644641 is an frugal number, since it uses more digits than its factorization.

228644641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30242 (or 15121 counting only the distinct ones).

The product of its digits is 73728, while the sum is 37.

The cubic root of 228644641 is about 611.4866908155.

The spelling of 228644641 in words is "two hundred twenty-eight million, six hundred forty-four thousand, six hundred forty-one".