13228779 has 8 divisors (see below), whose sum is σ = 17678800. Its totient is φ = 8798976.

The previous prime is 13228777. The next prime is 13228781. The reversal of 13228779 is 97782231.

It is an interprime number because it is at equal distance from previous prime (13228777) and next prime (13228781).

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

It is not a de Polignac number, because 13228779 - 2¹ = 13228777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13228777) 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, 3454 + ... + 6195.

It is an arithmetic number, because the mean of its divisors is an integer number (2209850).

Almost surely, 2^13228779 is an apocalyptic number.

13228779 is a deficient number, since it is larger than the sum of its proper divisors (4450021).

13228779 is an equidigital number, since it uses as much as digits as its factorization.

13228779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10109.

The product of its digits is 42336, while the sum is 39.

The square root of 13228779 is about 3637.1388480508. The cubic root of 13228779 is about 236.5047787505.

It can be divided in two parts, 1322 and 8779, that added together give a palindrome (10101).

The spelling of 13228779 in words is "thirteen million, two hundred twenty-eight thousand, seven hundred seventy-nine".