72275881 has 2 divisors, whose sum is σ = 72275882. Its totient is φ = 72275880.

The previous prime is 72275869. The next prime is 72275887. The reversal of 72275881 is 18857227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62410000 + 9865881 = 7900^2 + 3141^2 .

It is an emirp because it is prime and its reverse (18857227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72275881 - 2¹¹ = 72273833 is a prime.

It is a super-2 number, since 2×72275881² = 10447605948652322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72275887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36137940 + 36137941.

It is an arithmetic number, because the mean of its divisors is an integer number (36137941).

Almost surely, 2^72275881 is an apocalyptic number.

It is an amenable number.

72275881 is a deficient number, since it is larger than the sum of its proper divisors (1).

72275881 is an equidigital number, since it uses as much as digits as its factorization.

72275881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 40.

The square root of 72275881 is about 8501.5222754516. The cubic root of 72275881 is about 416.5474351823.

The spelling of 72275881 in words is "seventy-two million, two hundred seventy-five thousand, eight hundred eighty-one".