228217665 has 64 divisors (see below), whose sum is σ = 413070336. Its totient is φ = 106831872.

The previous prime is 228217597. The next prime is 228217667. The reversal of 228217665 is 566712822.

It is not a de Polignac number, because 228217665 - 2²¹ = 226120513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (228217667) 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 63 ways as a sum of consecutive naturals, for example, 338769 + ... + 339441.

It is an arithmetic number, because the mean of its divisors is an integer number (6454224).

Almost surely, 2^228217665 is an apocalyptic number.

It is an amenable number.

228217665 is a deficient number, since it is larger than the sum of its proper divisors (184852671).

228217665 is a wasteful number, since it uses less digits than its factorization.

228217665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778.

The product of its digits is 80640, while the sum is 39.

The square root of 228217665 is about 15106.8747595259. The cubic root of 228217665 is about 611.1058190971.

The spelling of 228217665 in words is "two hundred twenty-eight million, two hundred seventeen thousand, six hundred sixty-five".