72063644 has 24 divisors (see below), whose sum is σ = 128323440. Its totient is φ = 35405696.

The previous prime is 72063619. The next prime is 72063683. The reversal of 72063644 is 44636027.

It is a self number, because there is not a number n which added to its sum of digits gives 72063644.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58022 + ... + 59250.

It is an arithmetic number, because the mean of its divisors is an integer number (5346810).

Almost surely, 2^72063644 is an apocalyptic number.

It is an amenable number.

72063644 is a deficient number, since it is larger than the sum of its proper divisors (56259796).

72063644 is a wasteful number, since it uses less digits than its factorization.

72063644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1477 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 72063644 is about 8489.0308045147. The cubic root of 72063644 is about 416.1393070798.

The spelling of 72063644 in words is "seventy-two million, sixty-three thousand, six hundred forty-four".