71387865 has 16 divisors (see below), whose sum is σ = 126912000. Its totient is φ = 38073456.

The previous prime is 71387851. The next prime is 71387881. The reversal of 71387865 is 56878317.

It is not a de Polignac number, because 71387865 - 2¹¹ = 71385817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 71387865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264265 + ... + 264534.

It is an arithmetic number, because the mean of its divisors is an integer number (7932000).

Almost surely, 2^71387865 is an apocalyptic number.

It is an amenable number.

71387865 is a deficient number, since it is larger than the sum of its proper divisors (55524135).

71387865 is a wasteful number, since it uses less digits than its factorization.

71387865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528813 (or 528807 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 71387865 is about 8449.1339792904. The cubic root of 71387865 is about 414.8344333986.

The spelling of 71387865 in words is "seventy-one million, three hundred eighty-seven thousand, eight hundred sixty-five".