71438220050 has 18 divisors (see below), whose sum is σ = 132878604693. Its totient is φ = 28574532040.

The previous prime is 71438220047. The next prime is 71438220079. The reversal of 71438220050 is 5002283417.

It can be written as a sum of positive squares in 2 ways, for example, as 70009455649 + 1428764401 = 264593^2 + 37799^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=188995.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71438219989 and 71438220016.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1871051 + ... + 1908849.

Almost surely, 2^71438220050 is an apocalyptic number.

71438220050 is a deficient number, since it is larger than the sum of its proper divisors (61440384643).

71438220050 is an frugal number, since it uses more digits than its factorization.

71438220050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75610 (or 37806 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

Multiplying 71438220050 by its sum of digits (32), we get a square (2286023041600 = 1511960²).

The spelling of 71438220050 in words is "seventy-one billion, four hundred thirty-eight million, two hundred twenty thousand, fifty".