71011978 has 16 divisors (see below), whose sum is σ = 108553536. Its totient is φ = 34833600.

The previous prime is 71011973. The next prime is 71012023. The reversal of 71011978 is 87911017.

It is not an unprimeable number, because it can be changed into a prime (71011973) 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 in 7 ways as a sum of consecutive naturals, for example, 23650 + ... + 26482.

It is an arithmetic number, because the mean of its divisors is an integer number (6784596).

Almost surely, 2^71011978 is an apocalyptic number.

71011978 is a deficient number, since it is larger than the sum of its proper divisors (37541558).

71011978 is a wasteful number, since it uses less digits than its factorization.

71011978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3069.

The product of its (nonzero) digits is 3528, while the sum is 34.

The square root of 71011978 is about 8426.8605067368. The cubic root of 71011978 is about 414.1050594146.

The spelling of 71011978 in words is "seventy-one million, eleven thousand, nine hundred seventy-eight".