13278224 has 20 divisors (see below), whose sum is σ = 27240444. Its totient is φ = 6248448.

The previous prime is 13278217. The next prime is 13278229. The reversal of 13278224 is 42287231.

It can be written as a sum of positive squares in 2 ways, for example, as 7840000 + 5438224 = 2800^2 + 2332^2 .

It is a super-2 number, since 2×13278224² = 352622465188352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13278229) 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, 24137 + ... + 24680.

Almost surely, 2^13278224 is an apocalyptic number.

It is an amenable number.

13278224 is an abundant number, since it is smaller than the sum of its proper divisors (13962220).

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

13278224 is a wasteful number, since it uses less digits than its factorization.

13278224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48842 (or 48836 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 13278224 is about 3643.9297468530. The cubic root of 13278224 is about 236.7990724641.

The spelling of 13278224 in words is "thirteen million, two hundred seventy-eight thousand, two hundred twenty-four".