71456630640 has 40 divisors (see below), whose sum is σ = 221515555728. Its totient is φ = 19055101440.

The previous prime is 71456630639. The next prime is 71456630657. The reversal of 71456630640 is 4603665417.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 71456630592 and 71456630601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148867741 + ... + 148868220.

Almost surely, 2^71456630640 is an apocalyptic number.

It is an amenable number.

71456630640 is an abundant number, since it is smaller than the sum of its proper divisors (150058925088).

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

71456630640 is a wasteful number, since it uses less digits than its factorization.

71456630640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297735977 (or 297735971 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 71456630640 in words is "seventy-one billion, four hundred fifty-six million, six hundred thirty thousand, six hundred forty".