71957561240 has 64 divisors (see below), whose sum is σ = 171462432960. Its totient is φ = 27084513280.

The previous prime is 71957561219. The next prime is 71957561341. The reversal of 71957561240 is 4216575917.

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, 5619245 + ... + 5632035.

It is an arithmetic number, because the mean of its divisors is an integer number (2679100515).

Almost surely, 2^71957561240 is an apocalyptic number.

It is an amenable number.

71957561240 is an abundant number, since it is smaller than the sum of its proper divisors (99504871720).

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

71957561240 is a wasteful number, since it uses less digits than its factorization.

71957561240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21092 (or 21088 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 71957561240 in words is "seventy-one billion, nine hundred fifty-seven million, five hundred sixty-one thousand, two hundred forty".