72787717 has 2 divisors, whose sum is σ = 72787718. Its totient is φ = 72787716.

The previous prime is 72787703. The next prime is 72787787. The reversal of 72787717 is 71778727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69739201 + 3048516 = 8351^2 + 1746^2 .

It is an emirp because it is prime and its reverse (71778727) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72787717 is a prime.

It is a super-3 number, since 3×72787717³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72787787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36393858 + 36393859.

It is an arithmetic number, because the mean of its divisors is an integer number (36393859).

Almost surely, 2^72787717 is an apocalyptic number.

It is an amenable number.

72787717 is a deficient number, since it is larger than the sum of its proper divisors (1).

72787717 is an equidigital number, since it uses as much as digits as its factorization.

72787717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268912, while the sum is 46.

The square root of 72787717 is about 8531.5717778144. The cubic root of 72787717 is about 417.5284109414.

The spelling of 72787717 in words is "seventy-two million, seven hundred eighty-seven thousand, seven hundred seventeen".