71444840 has 16 divisors (see below), whose sum is σ = 160750980. Its totient is φ = 28577920.

The previous prime is 71444833. The next prime is 71444843. The reversal of 71444840 is 4844417.

It can be written as a sum of positive squares in 2 ways, for example, as 65383396 + 6061444 = 8086^2 + 2462^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71444797 and 71444806.

It is not an unprimeable number, because it can be changed into a prime (71444843) 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, 893021 + ... + 893100.

Almost surely, 2^71444840 is an apocalyptic number.

It is an amenable number.

71444840 is an abundant number, since it is smaller than the sum of its proper divisors (89306140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71444840 is a wasteful number, since it uses less digits than its factorization.

71444840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786132 (or 1786128 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 32.

The square root of 71444840 is about 8452.5049541541. The cubic root of 71444840 is about 414.9447645071.

It can be divided in two parts, 714 and 44840, that added together give a palindrome (45554).

The spelling of 71444840 in words is "seventy-one million, four hundred forty-four thousand, eight hundred forty".