228711813 has 8 divisors (see below), whose sum is σ = 332671776. Its totient is φ = 138613200.

The previous prime is 228711799. The next prime is 228711853. The reversal of 228711813 is 318117822.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 228711813 - 2¹⁴ = 228695429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 6930661 = 228711813 / (2 + 2 + 8 + 7 + 1 + 1 + 8 + 1 + 3).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228711853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3465298 + ... + 3465363.

It is an arithmetic number, because the mean of its divisors is an integer number (41583972).

Almost surely, 2^228711813 is an apocalyptic number.

It is an amenable number.

228711813 is a deficient number, since it is larger than the sum of its proper divisors (103959963).

228711813 is a wasteful number, since it uses less digits than its factorization.

228711813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6930675.

The product of its digits is 5376, while the sum is 33.

The square root of 228711813 is about 15123.2209862846. The cubic root of 228711813 is about 611.5465664987.

The spelling of 228711813 in words is "two hundred twenty-eight million, seven hundred eleven thousand, eight hundred thirteen".