228217025 has 6 divisors (see below), whose sum is σ = 282989142. Its totient is φ = 182573600.

The previous prime is 228217019. The next prime is 228217079. The reversal of 228217025 is 520712822.

It can be written as a sum of positive squares in 3 ways, for example, as 75620416 + 152596609 = 8696^2 + 12353^2 .

It is not a de Polignac number, because 228217025 - 2²⁰ = 227168449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4564316 + ... + 4564365.

It is an arithmetic number, because the mean of its divisors is an integer number (47164857).

Almost surely, 2^228217025 is an apocalyptic number.

228217025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

228217025 is a deficient number, since it is larger than the sum of its proper divisors (54772117).

228217025 is an equidigital number, since it uses as much as digits as its factorization.

228217025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128691 (or 9128686 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 228217025 is about 15106.8535771020. The cubic root of 228217025 is about 611.1052478470.

Adding to 228217025 its reverse (520712822), we get a palindrome (748929847).

The spelling of 228217025 in words is "two hundred twenty-eight million, two hundred seventeen thousand, twenty-five".