71564144 has 10 divisors (see below), whose sum is σ = 138655560. Its totient is φ = 35782064.

The previous prime is 71564131. The next prime is 71564159. The reversal of 71564144 is 44146517.

It is a self number, because there is not a number n which added to its sum of digits gives 71564144.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2236364 + ... + 2236395.

It is an arithmetic number, because the mean of its divisors is an integer number (13865556).

Almost surely, 2^71564144 is an apocalyptic number.

It is an amenable number.

71564144 is a deficient number, since it is larger than the sum of its proper divisors (67091416).

71564144 is a wasteful number, since it uses less digits than its factorization.

71564144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472767 (or 4472761 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 71564144 is about 8459.5593265843. The cubic root of 71564144 is about 415.1756047853.

The spelling of 71564144 in words is "seventy-one million, five hundred sixty-four thousand, one hundred forty-four".