72926719781 has 4 divisors (see below), whose sum is σ = 76097446752. Its totient is φ = 69755992812.

The previous prime is 72926719763. The next prime is 72926719783. The reversal of 72926719781 is 18791762927.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18791762927 = 7 ⋅2684537561.

It is a cyclic number.

It is not a de Polignac number, because 72926719781 - 2²² = 72922525477 is a prime.

It is a super-2 number, since 2×72926719781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72926719781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72926719783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1585363451 + ... + 1585363496.

It is an arithmetic number, because the mean of its divisors is an integer number (19024361688).

Almost surely, 2^72926719781 is an apocalyptic number.

It is an amenable number.

72926719781 is a deficient number, since it is larger than the sum of its proper divisors (3170726971).

72926719781 is a wasteful number, since it uses less digits than its factorization.

72926719781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3170726970.

The product of its digits is 5334336, while the sum is 59.

The spelling of 72926719781 in words is "seventy-two billion, nine hundred twenty-six million, seven hundred nineteen thousand, seven hundred eighty-one".