71680005 has 32 divisors (see below), whose sum is σ = 128056320. Its totient is φ = 38041920.

The previous prime is 71679991. The next prime is 71680031. The reversal of 71680005 is 50008617.

It is not a de Polignac number, because 71680005 - 2⁹ = 71679493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28915 + ... + 31295.

It is an arithmetic number, because the mean of its divisors is an integer number (4001760).

Almost surely, 2^71680005 is an apocalyptic number.

It is an amenable number.

71680005 is a deficient number, since it is larger than the sum of its proper divisors (56376315).

71680005 is a wasteful number, since it uses less digits than its factorization.

71680005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618 (or 2612 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 71680005 is about 8466.4044906914. The cubic root of 71680005 is about 415.3995378067.

The spelling of 71680005 in words is "seventy-one million, six hundred eighty thousand, five".