228820197 has 4 divisors (see below), whose sum is σ = 305093600. Its totient is φ = 152546796.

The previous prime is 228820177. The next prime is 228820199. The reversal of 228820197 is 791028822.

228820197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 228820197 - 2⁷ = 228820069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228820199) 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, 38136697 + ... + 38136702.

It is an arithmetic number, because the mean of its divisors is an integer number (76273400).

Almost surely, 2^228820197 is an apocalyptic number.

It is an amenable number.

228820197 is a deficient number, since it is larger than the sum of its proper divisors (76273403).

228820197 is an equidigital number, since it uses as much as digits as its factorization.

228820197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76273402.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 228820197 is about 15126.8039254827. The cubic root of 228820197 is about 611.6431529625.

The spelling of 228820197 in words is "two hundred twenty-eight million, eight hundred twenty thousand, one hundred ninety-seven".