71687091 has 8 divisors (see below), whose sum is σ = 109237504. Its totient is φ = 40964040.

The previous prime is 71687071. The next prime is 71687117. The reversal of 71687091 is 19078617.

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

It is not a de Polignac number, because 71687091 - 2⁶ = 71687027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71687071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1706815 + ... + 1706856.

It is an arithmetic number, because the mean of its divisors is an integer number (13654688).

Almost surely, 2^71687091 is an apocalyptic number.

71687091 is a deficient number, since it is larger than the sum of its proper divisors (37550413).

71687091 is a wasteful number, since it uses less digits than its factorization.

71687091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413681.

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 71687091 is about 8466.8229578750. The cubic root of 71687091 is about 415.4132256040.

The spelling of 71687091 in words is "seventy-one million, six hundred eighty-seven thousand, ninety-one".