72444644428 has 12 divisors (see below), whose sum is σ = 136530291520. Its totient is φ = 33435989712.

The previous prime is 72444644369. The next prime is 72444644477. The reversal of 72444644428 is 82444644427.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

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, 696583068 + ... + 696583171.

Almost surely, 2^72444644428 is an apocalyptic number.

It is an amenable number.

72444644428 is a deficient number, since it is larger than the sum of its proper divisors (64085647092).

72444644428 is a wasteful number, since it uses less digits than its factorization.

72444644428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393166256 (or 1393166254 counting only the distinct ones).

The product of its digits is 5505024, while the sum is 49.

Subtracting 72444644428 from its reverse (82444644427), we obtain a palindrome (9999999999).

The spelling of 72444644428 in words is "seventy-two billion, four hundred forty-four million, six hundred forty-four thousand, four hundred twenty-eight".