71688491 has 8 divisors (see below), whose sum is σ = 82199040. Its totient is φ = 61245288.

The previous prime is 71688469. The next prime is 71688503. The reversal of 71688491 is 19488617.

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

It is a cyclic number.

It is not a de Polignac number, because 71688491 - 2⁶ = 71688427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71688091) 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, 14531 + ... + 18828.

It is an arithmetic number, because the mean of its divisors is an integer number (10274880).

Almost surely, 2^71688491 is an apocalyptic number.

71688491 is a deficient number, since it is larger than the sum of its proper divisors (10510549).

71688491 is a wasteful number, since it uses less digits than its factorization.

71688491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33673.

The product of its digits is 96768, while the sum is 44.

The square root of 71688491 is about 8466.9056331106. The cubic root of 71688491 is about 415.4159298321.

The spelling of 71688491 in words is "seventy-one million, six hundred eighty-eight thousand, four hundred ninety-one".