72740233036421 has 16 divisors (see below), whose sum is σ = 74619781958400. Its totient is φ = 70890627083328.

The previous prime is 72740233036409. The next prime is 72740233036423. The reversal of 72740233036421 is 12463033204727.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72740233036421 is a prime.

It is a super-2 number, since 2×72740233036421² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72740233036423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17245346 + ... + 21044771.

It is an arithmetic number, because the mean of its divisors is an integer number (4663736372400).

Almost surely, 2^{72740233036421} is an apocalyptic number.

It is an amenable number.

72740233036421 is a deficient number, since it is larger than the sum of its proper divisors (1879548921979).

72740233036421 is a wasteful number, since it uses less digits than its factorization.

72740233036421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38290508.

The product of its (nonzero) digits is 1016064, while the sum is 44.

The spelling of 72740233036421 in words is "seventy-two trillion, seven hundred forty billion, two hundred thirty-three million, thirty-six thousand, four hundred twenty-one".