228819661 has 12 divisors (see below), whose sum is σ = 267726492. Its totient is φ = 194990208.

The previous prime is 228819659. The next prime is 228819683. The reversal of 228819661 is 166918822.

It is a happy number.

228819661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 104162436 + 124657225 = 10206^2 + 11165^2 .

It is not a de Polignac number, because 228819661 - 2¹ = 228819659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228819611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5020 + ... + 21973.

It is an arithmetic number, because the mean of its divisors is an integer number (22310541).

Almost surely, 2^228819661 is an apocalyptic number.

It is an amenable number.

228819661 is a deficient number, since it is larger than the sum of its proper divisors (38906831).

228819661 is a wasteful number, since it uses less digits than its factorization.

228819661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27180 (or 27173 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 228819661 is about 15126.7862085772. The cubic root of 228819661 is about 611.6426753808.

The spelling of 228819661 in words is "two hundred twenty-eight million, eight hundred nineteen thousand, six hundred sixty-one".