71871773 has 4 divisors (see below), whose sum is σ = 74350140. Its totient is φ = 69393408.

The previous prime is 71871769. The next prime is 71871781. The reversal of 71871773 is 37717817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37717817 = 197 ⋅191461.

It can be written as a sum of positive squares in 2 ways, for example, as 54715609 + 17156164 = 7397^2 + 4142^2 .

It is a cyclic number.

It is not a de Polignac number, because 71871773 - 2² = 71871769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71871773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71801773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1239140 + ... + 1239197.

It is an arithmetic number, because the mean of its divisors is an integer number (18587535).

Almost surely, 2^71871773 is an apocalyptic number.

It is an amenable number.

71871773 is a deficient number, since it is larger than the sum of its proper divisors (2478367).

71871773 is a wasteful number, since it uses less digits than its factorization.

71871773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478366.

The product of its digits is 57624, while the sum is 41.

The square root of 71871773 is about 8477.7221586933. The cubic root of 71871773 is about 415.7696521997.

The spelling of 71871773 in words is "seventy-one million, eight hundred seventy-one thousand, seven hundred seventy-three".