71987738169 has 8 divisors (see below), whose sum is σ = 96172225920. Its totient is φ = 47897537936.

The previous prime is 71987738129. The next prime is 71987738231. The reversal of 71987738169 is 96183778917.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71987738169 is a prime.

It is a super-2 number, since 2×71987738169² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71987738129) 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, 23570097 + ... + 23573150.

It is an arithmetic number, because the mean of its divisors is an integer number (12021528240).

Almost surely, 2^71987738169 is an apocalyptic number.

It is an amenable number.

71987738169 is a deficient number, since it is larger than the sum of its proper divisors (24184487751).

71987738169 is a wasteful number, since it uses less digits than its factorization.

71987738169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47143759.

The product of its digits is 32006016, while the sum is 66.

The spelling of 71987738169 in words is "seventy-one billion, nine hundred eighty-seven million, seven hundred thirty-eight thousand, one hundred sixty-nine".