71687741 has 12 divisors (see below), whose sum is σ = 76009500. Its totient is φ = 67601088.

The previous prime is 71687731. The next prime is 71687743. The reversal of 71687741 is 14778617.

It can be written as a sum of positive squares in 2 ways, for example, as 31416025 + 40271716 = 5605^2 + 6346^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71687741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71687743) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125705 + ... + 126273.

It is an arithmetic number, because the mean of its divisors is an integer number (6334125).

Almost surely, 2^71687741 is an apocalyptic number.

It is an amenable number.

71687741 is a deficient number, since it is larger than the sum of its proper divisors (4321759).

71687741 is a wasteful number, since it uses less digits than its factorization.

71687741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956 (or 937 counting only the distinct ones).

The product of its digits is 65856, while the sum is 41.

The square root of 71687741 is about 8466.8613429062. The cubic root of 71687741 is about 415.4144811429.

The spelling of 71687741 in words is "seventy-one million, six hundred eighty-seven thousand, seven hundred forty-one".