71443643724 has 18 divisors (see below), whose sum is σ = 180593655060. Its totient is φ = 23814547896.

The previous prime is 71443643699. The next prime is 71443643729. The reversal of 71443643724 is 42734634417.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 71443643724.

It is not an unprimeable number, because it can be changed into a prime (71443643729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 992272794 + ... + 992272865.

Almost surely, 2^71443643724 is an apocalyptic number.

It is an amenable number.

71443643724 is an abundant number, since it is smaller than the sum of its proper divisors (109150011336).

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

71443643724 is a wasteful number, since it uses less digits than its factorization.

71443643724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984545669 (or 1984545664 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 45.

The spelling of 71443643724 in words is "seventy-one billion, four hundred forty-three million, six hundred forty-three thousand, seven hundred twenty-four".