71638998028 has 12 divisors (see below), whose sum is σ = 135011957920. Its totient is φ = 33064152912.

The previous prime is 71638998023. The next prime is 71638998029. The reversal of 71638998028 is 82089983617.

It is not an unprimeable number, because it can be changed into a prime (71638998023) 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 3 ways as a sum of consecutive naturals, for example, 688836468 + ... + 688836571.

Almost surely, 2^71638998028 is an apocalyptic number.

It is an amenable number.

71638998028 is a deficient number, since it is larger than the sum of its proper divisors (63372959892).

71638998028 is a wasteful number, since it uses less digits than its factorization.

71638998028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377673056 (or 1377673054 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 71638998028 in words is "seventy-one billion, six hundred thirty-eight million, nine hundred ninety-eight thousand, twenty-eight".