71328644 has 12 divisors (see below), whose sum is σ = 128851968. Its totient is φ = 34513800.

The previous prime is 71328611. The next prime is 71328671. The reversal of 71328644 is 44682317.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287492 + ... + 287739.

It is an arithmetic number, because the mean of its divisors is an integer number (10737664).

Almost surely, 2^71328644 is an apocalyptic number.

It is an amenable number.

71328644 is a deficient number, since it is larger than the sum of its proper divisors (57523324).

71328644 is a wasteful number, since it uses less digits than its factorization.

71328644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575266 (or 575264 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 71328644 is about 8445.6286918145. The cubic root of 71328644 is about 414.7196907113.

The spelling of 71328644 in words is "seventy-one million, three hundred twenty-eight thousand, six hundred forty-four".