228643947 has 18 divisors (see below), whose sum is σ = 384184788. Its totient is φ = 130653432.

The previous prime is 228643903. The next prime is 228643963. The reversal of 228643947 is 749346822.

228643947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 228643947 - 2¹⁴ = 228627563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228643997) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 258793 + ... + 259674.

Almost surely, 2^228643947 is an apocalyptic number.

228643947 is a deficient number, since it is larger than the sum of its proper divisors (155540841).

228643947 is a wasteful number, since it uses less digits than its factorization.

228643947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518487 (or 518477 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 228643947 is about 15120.9770517649. The cubic root of 228643947 is about 611.4860721375.

The spelling of 228643947 in words is "two hundred twenty-eight million, six hundred forty-three thousand, nine hundred forty-seven".