71709444 has 18 divisors (see below), whose sum is σ = 181265630. Its totient is φ = 23903136.

The previous prime is 71709437. The next prime is 71709457. The reversal of 71709444 is 44490717.

It can be written as a sum of positive squares in only one way, i.e., 65804544 + 5904900 = 8112^2 + 2430^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1991929 = 71709444 / (7 + 1 + 7 + 0 + 9 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 71709399 and 71709408.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 995929 + ... + 996000.

Almost surely, 2^71709444 is an apocalyptic number.

It is an amenable number.

71709444 is an abundant number, since it is smaller than the sum of its proper divisors (109556186).

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

71709444 is a wasteful number, since it uses less digits than its factorization.

71709444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991939 (or 1991934 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 71709444 is about 8468.1428896778. The cubic root of 71709444 is about 415.4563982624.

The spelling of 71709444 in words is "seventy-one million, seven hundred nine thousand, four hundred forty-four".