72440729773 has 2 divisors, whose sum is σ = 72440729774. Its totient is φ = 72440729772.

The previous prime is 72440729743. The next prime is 72440729797. The reversal of 72440729773 is 37792704427.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71774160649 + 666569124 = 267907^2 + 25818^2 .

It is an emirp because it is prime and its reverse (37792704427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72440729773 - 2¹³ = 72440721581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72440729773.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72440729743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36220364886 + 36220364887.

It is an arithmetic number, because the mean of its divisors is an integer number (36220364887).

Almost surely, 2^72440729773 is an apocalyptic number.

It is an amenable number.

72440729773 is a deficient number, since it is larger than the sum of its proper divisors (1).

72440729773 is an equidigital number, since it uses as much as digits as its factorization.

72440729773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4148928, while the sum is 52.

The spelling of 72440729773 in words is "seventy-two billion, four hundred forty million, seven hundred twenty-nine thousand, seven hundred seventy-three".