71728441645 has 16 divisors (see below), whose sum is σ = 98523929088. Its totient is φ = 49108469760.

The previous prime is 71728441627. The next prime is 71728441699. The reversal of 71728441645 is 54614482717.

It is not a de Polignac number, because 71728441645 - 2¹⁵ = 71728408877 is a prime.

It is a super-3 number, since 3×71728441645³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1576149 + ... + 1621018.

It is an arithmetic number, because the mean of its divisors is an integer number (6157745568).

Almost surely, 2^71728441645 is an apocalyptic number.

It is an amenable number.

71728441645 is a deficient number, since it is larger than the sum of its proper divisors (26795487443).

71728441645 is a wasteful number, since it uses less digits than its factorization.

71728441645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197820.

The product of its digits is 1505280, while the sum is 49.

The spelling of 71728441645 in words is "seventy-one billion, seven hundred twenty-eight million, four hundred forty-one thousand, six hundred forty-five".