228021005 has 8 divisors (see below), whose sum is σ = 276047352. Its totient is φ = 180802048.

The previous prime is 228020977. The next prime is 228021037. The reversal of 228021005 is 500120822.

It can be written as a sum of positive squares in 4 ways, for example, as 7171684 + 220849321 = 2678^2 + 14861^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 228021005 - 2²⁴ = 211243789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201224 + ... + 202353.

It is an arithmetic number, because the mean of its divisors is an integer number (34505919).

Almost surely, 2^228021005 is an apocalyptic number.

It is an amenable number.

228021005 is a deficient number, since it is larger than the sum of its proper divisors (48026347).

228021005 is a wasteful number, since it uses less digits than its factorization.

228021005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403695.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 228021005 is about 15100.3643995766. The cubic root of 228021005 is about 610.9302343726.

Adding to 228021005 its reverse (500120822), we get a palindrome (728141827).

The spelling of 228021005 in words is "two hundred twenty-eight million, twenty-one thousand, five".