71040665 has 12 divisors (see below), whose sum is σ = 85989036. Its totient is φ = 56343168.

The previous prime is 71040653. The next prime is 71040679. The reversal of 71040665 is 56604017.

It can be written as a sum of positive squares in 6 ways, for example, as 413449 + 70627216 = 643^2 + 8404^2 .

It is not a de Polignac number, because 71040665 - 2¹² = 71036569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93467 + ... + 94223.

It is an arithmetic number, because the mean of its divisors is an integer number (7165753).

Almost surely, 2^71040665 is an apocalyptic number.

It is an amenable number.

71040665 is a deficient number, since it is larger than the sum of its proper divisors (14948371).

71040665 is an equidigital number, since it uses as much as digits as its factorization.

71040665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 71040665 is about 8428.5624515691. The cubic root of 71040665 is about 414.1608144805.

The spelling of 71040665 in words is "seventy-one million, forty thousand, six hundred sixty-five".