228710257 has 4 divisors (see below), whose sum is σ = 228856320. Its totient is φ = 228564196.

The previous prime is 228710213. The next prime is 228710263. The reversal of 228710257 is 752017822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228710257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228710267) 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, 70657 + ... + 73822.

It is an arithmetic number, because the mean of its divisors is an integer number (57214080).

Almost surely, 2^228710257 is an apocalyptic number.

It is an amenable number.

228710257 is a deficient number, since it is larger than the sum of its proper divisors (146063).

228710257 is a wasteful number, since it uses less digits than its factorization.

228710257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146062.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 228710257 is about 15123.1695421297. The cubic root of 228710257 is about 611.5451796462.

It can be divided in two parts, 2287 and 10257, that added together give a square (12544 = 112²).

The spelling of 228710257 in words is "two hundred twenty-eight million, seven hundred ten thousand, two hundred fifty-seven".