71891365 has 16 divisors (see below), whose sum is σ = 106178688. Its totient is φ = 45504576.

The previous prime is 71891299. The next prime is 71891389. The reversal of 71891365 is 56319817.

It is not a de Polignac number, because 71891365 - 2⁹ = 71890853 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 78547 + ... + 79456.

It is an arithmetic number, because the mean of its divisors is an integer number (6636168).

Almost surely, 2^71891365 is an apocalyptic number.

It is an amenable number.

71891365 is a deficient number, since it is larger than the sum of its proper divisors (34287323).

71891365 is a wasteful number, since it uses less digits than its factorization.

71891365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158028.

The product of its digits is 45360, while the sum is 40.

The square root of 71891365 is about 8478.8775790195. The cubic root of 71891365 is about 415.8074278967.

The spelling of 71891365 in words is "seventy-one million, eight hundred ninety-one thousand, three hundred sixty-five".