228458257 has 6 divisors (see below), whose sum is σ = 242687798. Its totient is φ = 215019264.

The previous prime is 228458233. The next prime is 228458267. The reversal of 228458257 is 752854822.

It can be written as a sum of positive squares in 3 ways, for example, as 36469521 + 191988736 = 6039^2 + 13856^2 .

It is not a de Polignac number, because 228458257 - 2⁷ = 228458129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228458227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394968 + ... + 395545.

Almost surely, 2^228458257 is an apocalyptic number.

It is an amenable number.

228458257 is a deficient number, since it is larger than the sum of its proper divisors (14229541).

228458257 is an equidigital number, since it uses as much as digits as its factorization.

228458257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790547 (or 790530 counting only the distinct ones).

The product of its digits is 358400, while the sum is 43.

The square root of 228458257 is about 15114.8356590470. The cubic root of 228458257 is about 611.3204906696.

The spelling of 228458257 in words is "two hundred twenty-eight million, four hundred fifty-eight thousand, two hundred fifty-seven".