71748443881 has 9 divisors (see below), whose sum is σ = 72082941399. Its totient is φ = 71415495144.

The previous prime is 71748443813. The next prime is 71748443887. The reversal of 71748443881 is 18834484717.

The square root of 71748443881 is 267859.

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., 12366552025 + 59381891856 = 111205^2 + 243684^2 .

It is a de Polignac number, because none of the positive numbers 2^k-71748443881 is a prime.

It is a super-2 number, since 2×71748443881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71748443887) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 74196460 + ... + 74197426.

It is an arithmetic number, because the mean of its divisors is an integer number (8009215711).

Almost surely, 2^71748443881 is an apocalyptic number.

71748443881 is the 267859-th square number.

71748443881 is the 133930-th centered octagonal number.

It is an amenable number.

71748443881 is a deficient number, since it is larger than the sum of its proper divisors (334497518).

71748443881 is an frugal number, since it uses more digits than its factorization.

71748443881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488 (or 1244 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 55.

The spelling of 71748443881 in words is "seventy-one billion, seven hundred forty-eight million, four hundred forty-three thousand, eight hundred eighty-one".