71689887 has 32 divisors (see below), whose sum is σ = 110888960. Its totient is φ = 45722880.

The previous prime is 71689883. The next prime is 71689889. The reversal of 71689887 is 78898617.

It is not a de Polignac number, because 71689887 - 2² = 71689883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71689883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80748 + ... + 81630.

It is an arithmetic number, because the mean of its divisors is an integer number (3465280).

Almost surely, 2^71689887 is an apocalyptic number.

71689887 is a deficient number, since it is larger than the sum of its proper divisors (39199073).

71689887 is a wasteful number, since it uses less digits than its factorization.

71689887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020 (or 1014 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 71689887 is about 8466.9880713274. The cubic root of 71689887 is about 415.4186262987.

The spelling of 71689887 in words is "seventy-one million, six hundred eighty-nine thousand, eight hundred eighty-seven".