228278197 has 16 divisors (see below), whose sum is σ = 279597312. Its totient is φ = 182096640.

The previous prime is 228278191. The next prime is 228278209. The reversal of 228278197 is 791872822.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 228278197 - 2¹⁵ = 228245429 is a prime.

It is a super-2 number, since 2×228278197² = 104221870451141618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228278191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13204 + ... + 25117.

It is an arithmetic number, because the mean of its divisors is an integer number (17474832).

Almost surely, 2^228278197 is an apocalyptic number.

It is an amenable number.

228278197 is a deficient number, since it is larger than the sum of its proper divisors (51319115).

228278197 is a wasteful number, since it uses less digits than its factorization.

228278197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38388.

The product of its digits is 225792, while the sum is 46.

The square root of 228278197 is about 15108.8780854172. The cubic root of 228278197 is about 611.1598438187.

The spelling of 228278197 in words is "two hundred twenty-eight million, two hundred seventy-eight thousand, one hundred ninety-seven".