71915938640 has 80 divisors (see below), whose sum is σ = 205790245248. Its totient is φ = 22760206848.

The previous prime is 71915938631. The next prime is 71915938669. The reversal of 71915938640 is 4683951917.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×71915938640³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4932002 + ... + 4946561.

Almost surely, 2^71915938640 is an apocalyptic number.

71915938640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71915938640 is an abundant number, since it is smaller than the sum of its proper divisors (133874306608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71915938640 is a wasteful number, since it uses less digits than its factorization.

71915938640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9878596 (or 9878590 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 71915938640 in words is "seventy-one billion, nine hundred fifteen million, nine hundred thirty-eight thousand, six hundred forty".