228428661 has 8 divisors (see below), whose sum is σ = 309117664. Its totient is φ = 150012720.

The previous prime is 228428653. The next prime is 228428687. The reversal of 228428661 is 166824822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228428661 - 2³ = 228428653 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 (228423661) 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 7 ways as a sum of consecutive naturals, for example, 568030 + ... + 568431.

It is an arithmetic number, because the mean of its divisors is an integer number (38639708).

Almost surely, 2^228428661 is an apocalyptic number.

It is an amenable number.

228428661 is a deficient number, since it is larger than the sum of its proper divisors (80689003).

228428661 is a wasteful number, since it uses less digits than its factorization.

228428661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136531.

The product of its digits is 73728, while the sum is 39.

The square root of 228428661 is about 15113.8565892362. The cubic root of 228428661 is about 611.2940913574.

The spelling of 228428661 in words is "two hundred twenty-eight million, four hundred twenty-eight thousand, six hundred sixty-one".