71688387 has 8 divisors (see below), whose sum is σ = 100615360. Its totient is φ = 45276840.

The previous prime is 71688367. The next prime is 71688389. The reversal of 71688387 is 78388617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71688387 - 2¹¹ = 71686339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71688389) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 628789 + ... + 628902.

It is an arithmetic number, because the mean of its divisors is an integer number (12576920).

Almost surely, 2^71688387 is an apocalyptic number.

71688387 is a deficient number, since it is larger than the sum of its proper divisors (28926973).

71688387 is a wasteful number, since it uses less digits than its factorization.

71688387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257713.

The product of its digits is 451584, while the sum is 48.

The square root of 71688387 is about 8466.8994915494. The cubic root of 71688387 is about 415.4157289478.

The spelling of 71688387 in words is "seventy-one million, six hundred eighty-eight thousand, three hundred eighty-seven".