13578228 has 18 divisors (see below), whose sum is σ = 34322834. Its totient is φ = 4526064.

The previous prime is 13578203. The next prime is 13578241. The reversal of 13578228 is 82287531.

It can be written as a sum of positive squares in only one way, i.e., 10381284 + 3196944 = 3222^2 + 1788^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 377173 = 13578228 / (1 + 3 + 5 + 7 + 8 + 2 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 13578192 and 13578201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 188551 + ... + 188622.

Almost surely, 2^13578228 is an apocalyptic number.

13578228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13578228 is an abundant number, since it is smaller than the sum of its proper divisors (20744606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13578228 is a wasteful number, since it uses less digits than its factorization.

13578228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377183 (or 377178 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 13578228 is about 3684.8647193622. The cubic root of 13578228 is about 238.5691952754.

The spelling of 13578228 in words is "thirteen million, five hundred seventy-eight thousand, two hundred twenty-eight".