71987547928 has 64 divisors (see below), whose sum is σ = 143749440000. Its totient is φ = 33701184000.

The previous prime is 71987547923. The next prime is 71987547941. The reversal of 71987547928 is 82974578917.

It is a congruent number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4559568 + ... + 4575328.

It is an arithmetic number, because the mean of its divisors is an integer number (2246085000).

Almost surely, 2^71987547928 is an apocalyptic number.

It is an amenable number.

71987547928 is a deficient number, since it is larger than the sum of its proper divisors (71761892072).

71987547928 is a wasteful number, since it uses less digits than its factorization.

71987547928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16136 (or 16132 counting only the distinct ones).

The product of its digits is 71124480, while the sum is 67.

The spelling of 71987547928 in words is "seventy-one billion, nine hundred eighty-seven million, five hundred forty-seven thousand, nine hundred twenty-eight".