71891377052 has 36 divisors (see below), whose sum is σ = 138346942608. Its totient is φ = 32663716800.

The previous prime is 71891377021. The next prime is 71891377057. The reversal of 71891377052 is 25077319817.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71891377057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1127177 + ... + 1189247.

It is an arithmetic number, because the mean of its divisors is an integer number (3842970628).

Almost surely, 2^71891377052 is an apocalyptic number.

It is an amenable number.

71891377052 is a deficient number, since it is larger than the sum of its proper divisors (66455565556).

71891377052 is a wasteful number, since it uses less digits than its factorization.

71891377052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64490 (or 64477 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 50.

The spelling of 71891377052 in words is "seventy-one billion, eight hundred ninety-one million, three hundred seventy-seven thousand, fifty-two".