12688978 has 16 divisors (see below), whose sum is σ = 19443456. Its totient is φ = 6209280.

The previous prime is 12688969. The next prime is 12688981. The reversal of 12688978 is 87988621.

It is a super-2 number, since 2×12688978² = 322020325368968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27175 + ... + 27637.

It is an arithmetic number, because the mean of its divisors is an integer number (1215216).

Almost surely, 2^12688978 is an apocalyptic number.

12688978 is a deficient number, since it is larger than the sum of its proper divisors (6754478).

12688978 is a wasteful number, since it uses less digits than its factorization.

12688978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729.

The product of its digits is 387072, while the sum is 49.

The square root of 12688978 is about 3562.1591766792. The cubic root of 12688978 is about 233.2431411055.

The spelling of 12688978 in words is "twelve million, six hundred eighty-eight thousand, nine hundred seventy-eight".