13081978 has 16 divisors (see below), whose sum is σ = 24151680. Its totient is φ = 5175216.

The previous prime is 13081973. The next prime is 13081997. The reversal of 13081978 is 87918031.

It is a super-2 number, since 2×13081978² = 342276296784968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13081973) 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, 35758 + ... + 36121.

It is an arithmetic number, because the mean of its divisors is an integer number (1509480).

Almost surely, 2^13081978 is an apocalyptic number.

13081978 is a deficient number, since it is larger than the sum of its proper divisors (11069702).

13081978 is a wasteful number, since it uses less digits than its factorization.

13081978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71901.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 13081978 is about 3616.9017127923. The cubic root of 13081978 is about 235.6266840332.

The spelling of 13081978 in words is "thirteen million, eighty-one thousand, nine hundred seventy-eight".