72420017717644 has 96 divisors (see below), whose sum is σ = 137493103345920. Its totient is φ = 33273394762752.

The previous prime is 72420017717623. The next prime is 72420017717651. The reversal of 72420017717644 is 44671771002427.

It is a junction number, because it is equal to n+sod(n) for n = 72420017717591 and 72420017717600.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80882899 + ... + 81773365.

It is an arithmetic number, because the mean of its divisors is an integer number (1432219826520).

Almost surely, 2^{72420017717644} is an apocalyptic number.

It is an amenable number.

72420017717644 is a deficient number, since it is larger than the sum of its proper divisors (65073085628276).

72420017717644 is a wasteful number, since it uses less digits than its factorization.

72420017717644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890807 (or 890805 counting only the distinct ones).

The product of its (nonzero) digits is 3687936, while the sum is 52.

The spelling of 72420017717644 in words is "seventy-two trillion, four hundred twenty billion, seventeen million, seven hundred seventeen thousand, six hundred forty-four".