71685937 has 4 divisors (see below), whose sum is σ = 71708260. Its totient is φ = 71663616.

The previous prime is 71685877. The next prime is 71685947. The reversal of 71685937 is 73958617.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46294416 + 25391521 = 6804^2 + 5039^2 .

It is a 4-Lehmer number, since φ(71685937) divides (71685937-1)⁴.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71685937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71685947) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5328 + ... + 13105.

It is an arithmetic number, because the mean of its divisors is an integer number (17927065).

Almost surely, 2^71685937 is an apocalyptic number.

It is an amenable number.

71685937 is a deficient number, since it is larger than the sum of its proper divisors (22323).

71685937 is a wasteful number, since it uses less digits than its factorization.

71685937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22322.

The product of its digits is 317520, while the sum is 46.

The square root of 71685937 is about 8466.7548092525. The cubic root of 71685937 is about 415.4109965210.

The spelling of 71685937 in words is "seventy-one million, six hundred eighty-five thousand, nine hundred thirty-seven".