71978107 has 2 divisors, whose sum is σ = 71978108. Its totient is φ = 71978106.

The previous prime is 71978077. The next prime is 71978117. The reversal of 71978107 is 70187917.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71978107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71978107.

It is not a weakly prime, because it can be changed into another prime (71978117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35989053 + 35989054.

It is an arithmetic number, because the mean of its divisors is an integer number (35989054).

Almost surely, 2^71978107 is an apocalyptic number.

71978107 is a deficient number, since it is larger than the sum of its proper divisors (1).

71978107 is an equidigital number, since it uses as much as digits as its factorization.

71978107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 71978107 is about 8483.9912187602. The cubic root of 71978107 is about 415.9745943404.

The spelling of 71978107 in words is "seventy-one million, nine hundred seventy-eight thousand, one hundred seven".