228128819 has 12 divisors (see below), whose sum is σ = 237176784. Its totient is φ = 219415392.

The previous prime is 228128773. The next prime is 228128827. The reversal of 228128819 is 918821822.

It is not a de Polignac number, because 228128819 - 2¹² = 228124723 is a prime.

It is a super-2 number, since 2×228128819² = 104085516116669522, 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 (228128419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409289 + ... + 409845.

It is an arithmetic number, because the mean of its divisors is an integer number (19764732).

Almost surely, 2^228128819 is an apocalyptic number.

228128819 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

228128819 is a deficient number, since it is larger than the sum of its proper divisors (9047965).

228128819 is an equidigital number, since it uses as much as digits as its factorization.

228128819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1073 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 228128819 is about 15103.9338915396. The cubic root of 228128819 is about 611.0265068686.

The spelling of 228128819 in words is "two hundred twenty-eight million, one hundred twenty-eight thousand, eight hundred nineteen".