72123798644 has 12 divisors (see below), whose sum is σ = 126219822624. Its totient is φ = 36060992184.

The previous prime is 72123798623. The next prime is 72123798673. The reversal of 72123798644 is 44689732127.

It is a happy number.

It is a congruent number.

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, 28664 + ... + 380879.

It is an arithmetic number, because the mean of its divisors is an integer number (10518318552).

Almost surely, 2^72123798644 is an apocalyptic number.

It is an amenable number.

72123798644 is a deficient number, since it is larger than the sum of its proper divisors (54096023980).

72123798644 is a wasteful number, since it uses less digits than its factorization.

72123798644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453574 (or 453572 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 53.

The spelling of 72123798644 in words is "seventy-two billion, one hundred twenty-three million, seven hundred ninety-eight thousand, six hundred forty-four".