71756687064 has 64 divisors (see below), whose sum is σ = 189972851040. Its totient is φ = 22508503040.

The previous prime is 71756687063. The next prime is 71756687069. The reversal of 71756687064 is 46078665717.

It is a junction number, because it is equal to n+sod(n) for n = 71756686995 and 71756687013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71756687063) 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, 5150572 + ... + 5164484.

Almost surely, 2^71756687064 is an apocalyptic number.

It is an amenable number.

71756687064 is an abundant number, since it is smaller than the sum of its proper divisors (118216163976).

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

71756687064 is a wasteful number, since it uses less digits than its factorization.

71756687064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26580 (or 26576 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 57.

The spelling of 71756687064 in words is "seventy-one billion, seven hundred fifty-six million, six hundred eighty-seven thousand, sixty-four".