71939144 has 16 divisors (see below), whose sum is σ = 134987820. Its totient is φ = 35942400.

The previous prime is 71939143. The next prime is 71939167. The reversal of 71939144 is 44193917.

It can be written as a sum of positive squares in 2 ways, for example, as 66227044 + 5712100 = 8138^2 + 2390^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71939098 and 71939107.

It is not an unprimeable number, because it can be changed into a prime (71939141) 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, 11912 + ... + 16904.

Almost surely, 2^71939144 is an apocalyptic number.

It is an amenable number.

71939144 is a deficient number, since it is larger than the sum of its proper divisors (63048676).

71939144 is a wasteful number, since it uses less digits than its factorization.

71939144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800 (or 6796 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 71939144 is about 8481.6946419922. The cubic root of 71939144 is about 415.8995227009.

The spelling of 71939144 in words is "seventy-one million, nine hundred thirty-nine thousand, one hundred forty-four".