71988109636 has 9 divisors (see below), whose sum is σ = 125980130941. Its totient is φ = 35993786512.

The previous prime is 71988109631. The next prime is 71988109667. The reversal of 71988109636 is 63690188917.

The square root of 71988109636 is 268306.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 26253720900 + 45734388736 = 162030^2 + 213856^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71988109631) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 469536 + ... + 603688.

Almost surely, 2^71988109636 is an apocalyptic number.

71988109636 is the 268306-th square number.

It is an amenable number.

71988109636 is a deficient number, since it is larger than the sum of its proper divisors (53992021305).

71988109636 is an frugal number, since it uses more digits than its factorization.

71988109636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268310 (or 134155 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 71988109636 in words is "seventy-one billion, nine hundred eighty-eight million, one hundred nine thousand, six hundred thirty-six".