71987547929 has 8 divisors (see below), whose sum is σ = 79862919840. Its totient is φ = 64334017600.

The previous prime is 71987547923. The next prime is 71987547941. The reversal of 71987547929 is 92974578917.

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 71987547929 - 2²⁴ = 71970770713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71987547923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55459712 + ... + 55461009.

It is an arithmetic number, because the mean of its divisors is an integer number (9982864980).

Almost surely, 2^71987547929 is an apocalyptic number.

It is an amenable number.

71987547929 is a deficient number, since it is larger than the sum of its proper divisors (7875371911).

71987547929 is a wasteful number, since it uses less digits than its factorization.

71987547929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110920791.

The product of its digits is 80015040, while the sum is 68.

It can be divided in two parts, 71987 and 547929, that added together give a palindrome (619916).

The spelling of 71987547929 in words is "seventy-one billion, nine hundred eighty-seven million, five hundred forty-seven thousand, nine hundred twenty-nine".