71138444 has 48 divisors (see below), whose sum is σ = 139845216. Its totient is φ = 31449600.

The previous prime is 71138443. The next prime is 71138447. The reversal of 71138444 is 44483117.

It is a super-5 number, since 5×71138444⁵ (a number of 40 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 71138444.

It is not an unprimeable number, because it can be changed into a prime (71138443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129779 + ... + 130325.

It is an arithmetic number, because the mean of its divisors is an integer number (2913442).

Almost surely, 2^71138444 is an apocalyptic number.

It is an amenable number.

71138444 is a deficient number, since it is larger than the sum of its proper divisors (68706772).

71138444 is a wasteful number, since it uses less digits than its factorization.

71138444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 664 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 71138444 is about 8434.3609123632. The cubic root of 71138444 is about 414.3507416866.

The spelling of 71138444 in words is "seventy-one million, one hundred thirty-eight thousand, four hundred forty-four".