228678109 has 4 divisors (see below), whose sum is σ = 249467040. Its totient is φ = 207889180.

The previous prime is 228678097. The next prime is 228678133. The reversal of 228678109 is 901876822.

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 not a de Polignac number, because 228678109 - 2²¹ = 226580957 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 (228678139) 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, 10394449 + ... + 10394470.

It is an arithmetic number, because the mean of its divisors is an integer number (62366760).

Almost surely, 2^228678109 is an apocalyptic number.

It is an amenable number.

228678109 is a deficient number, since it is larger than the sum of its proper divisors (20788931).

228678109 is a wasteful number, since it uses less digits than its factorization.

228678109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20788930.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 228678109 is about 15122.1066323446. The cubic root of 228678109 is about 611.5165249400.

It can be divided in two parts, 22867 and 8109, that added together give a square (30976 = 176²).

The spelling of 228678109 in words is "two hundred twenty-eight million, six hundred seventy-eight thousand, one hundred nine".