71843397984 has 96 divisors (see below), whose sum is σ = 209693484000. Its totient is φ = 23930629632.

The previous prime is 71843397953. The next prime is 71843397991. The reversal of 71843397984 is 48979334817.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×71843397984² (a number of 23 digits) contains 22 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, 1205562 + ... + 1263750.

It is an arithmetic number, because the mean of its divisors is an integer number (2184307125).

Almost surely, 2^71843397984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71843397984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104846742000).

71843397984 is an abundant number, since it is smaller than the sum of its proper divisors (137850086016).

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

71843397984 is a wasteful number, since it uses less digits than its factorization.

71843397984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59637 (or 59623 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 71843397984 in words is "seventy-one billion, eight hundred forty-three million, three hundred ninety-seven thousand, nine hundred eighty-four".