72755281 has 2 divisors, whose sum is σ = 72755282. Its totient is φ = 72755280.

The previous prime is 72755261. The next prime is 72755317. The reversal of 72755281 is 18255727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48163600 + 24591681 = 6940^2 + 4959^2 .

It is a cyclic number.

It is not a de Polignac number, because 72755281 - 2⁷ = 72755153 is a prime.

It is a super-3 number, since 3×72755281³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 72755281.

It is not a weakly prime, because it can be changed into another prime (72755251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36377640 + 36377641.

It is an arithmetic number, because the mean of its divisors is an integer number (36377641).

Almost surely, 2^72755281 is an apocalyptic number.

It is an amenable number.

72755281 is a deficient number, since it is larger than the sum of its proper divisors (1).

72755281 is an equidigital number, since it uses as much as digits as its factorization.

72755281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39200, while the sum is 37.

The square root of 72755281 is about 8529.6706267007. The cubic root of 72755281 is about 417.4663814110.

The spelling of 72755281 in words is "seventy-two million, seven hundred fifty-five thousand, two hundred eighty-one".