13178978 has 18 divisors (see below), whose sum is σ = 21139713. Its totient is φ = 6160800.

The previous prime is 13178969. The next prime is 13178981. The reversal of 13178978 is 87987131.

It can be written as a sum of positive squares in 2 ways, for example, as 12061729 + 1117249 = 3473^2 + 1057^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2567.

It is a super-2 number, since 2×13178978² = 347370922248968, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 87203 + ... + 87353.

Almost surely, 2^13178978 is an apocalyptic number.

13178978 is a deficient number, since it is larger than the sum of its proper divisors (7960735).

13178978 is an equidigital number, since it uses as much as digits as its factorization.

13178978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 170 counting only the distinct ones).

The product of its digits is 84672, while the sum is 44.

The square root of 13178978 is about 3630.2862146117. The cubic root of 13178978 is about 236.2076239514.

The spelling of 13178978 in words is "thirteen million, one hundred seventy-eight thousand, nine hundred seventy-eight".