228484721 has 4 divisors (see below), whose sum is σ = 228515700. Its totient is φ = 228453744.

The previous prime is 228484681. The next prime is 228484723. The reversal of 228484721 is 127484822.

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 2 ways, for example, as 226201600 + 2283121 = 15040^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 228484721 - 2¹⁴ = 228468337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228484723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675 + ... + 21543.

It is an arithmetic number, because the mean of its divisors is an integer number (57128925).

Almost surely, 2^228484721 is an apocalyptic number.

It is an amenable number.

228484721 is a deficient number, since it is larger than the sum of its proper divisors (30979).

228484721 is a wasteful number, since it uses less digits than its factorization.

228484721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30978.

The product of its digits is 57344, while the sum is 38.

The square root of 228484721 is about 15115.7110649814. The cubic root of 228484721 is about 611.3440943410.

The spelling of 228484721 in words is "two hundred twenty-eight million, four hundred eighty-four thousand, seven hundred twenty-one".