228404257 has 4 divisors (see below), whose sum is σ = 228705156. Its totient is φ = 228103360.

The previous prime is 228404243. The next prime is 228404269. The reversal of 228404257 is 752404822.

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 12931216 + 215473041 = 3596^2 + 14679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228404257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228404207) 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 3 ways as a sum of consecutive naturals, for example, 149308 + ... + 150829.

It is an arithmetic number, because the mean of its divisors is an integer number (57176289).

Almost surely, 2^228404257 is an apocalyptic number.

It is an amenable number.

228404257 is a deficient number, since it is larger than the sum of its proper divisors (300899).

228404257 is an equidigital number, since it uses as much as digits as its factorization.

228404257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300898.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 228404257 is about 15113.0492290603. The cubic root of 228404257 is about 611.2723215377.

The spelling of 228404257 in words is "two hundred twenty-eight million, four hundred four thousand, two hundred fifty-seven".