71987613 has 8 divisors (see below), whose sum is σ = 96226848. Its totient is φ = 47870064.

The previous prime is 71987593. The next prime is 71987651. The reversal of 71987613 is 31678917.

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

It is not a de Polignac number, because 71987613 - 2⁹ = 71987101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71987813) 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 7 ways as a sum of consecutive naturals, for example, 29031 + ... + 31412.

It is an arithmetic number, because the mean of its divisors is an integer number (12028356).

Almost surely, 2^71987613 is an apocalyptic number.

It is an amenable number.

71987613 is a deficient number, since it is larger than the sum of its proper divisors (24239235).

71987613 is a wasteful number, since it uses less digits than its factorization.

71987613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60843.

The product of its digits is 63504, while the sum is 42.

The square root of 71987613 is about 8484.5514318672. The cubic root of 71987613 is about 415.9929058362.

The spelling of 71987613 in words is "seventy-one million, nine hundred eighty-seven thousand, six hundred thirteen".