228217733 has 4 divisors (see below), whose sum is σ = 236087340. Its totient is φ = 220348128.

The previous prime is 228217711. The next prime is 228217771. The reversal of 228217733 is 337712822.

It is a happy number.

228217733 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92891044 + 135326689 = 9638^2 + 11633^2 .

It is a cyclic number.

It is not a de Polignac number, because 228217733 - 2⁶ = 228217669 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 228217693 and 228217702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228217433) 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, 3934760 + ... + 3934817.

It is an arithmetic number, because the mean of its divisors is an integer number (59021835).

Almost surely, 2^228217733 is an apocalyptic number.

It is an amenable number.

228217733 is a deficient number, since it is larger than the sum of its proper divisors (7869607).

228217733 is an equidigital number, since it uses as much as digits as its factorization.

228217733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7869606.

The product of its digits is 28224, while the sum is 35.

The square root of 228217733 is about 15106.8770101567. The cubic root of 228217733 is about 611.1058797924.

The spelling of 228217733 in words is "two hundred twenty-eight million, two hundred seventeen thousand, seven hundred thirty-three".