72727229 has 2 divisors, whose sum is σ = 72727230. Its totient is φ = 72727228.

The previous prime is 72727223. The next prime is 72727243. The reversal of 72727229 is 92272727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72216004 + 511225 = 8498^2 + 715^2 .

It is an emirp because it is prime and its reverse (92272727) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72727229 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72727192 and 72727201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72727223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36363614 + 36363615.

It is an arithmetic number, because the mean of its divisors is an integer number (36363615).

Almost surely, 2^72727229 is an apocalyptic number.

It is an amenable number.

72727229 is a deficient number, since it is larger than the sum of its proper divisors (1).

72727229 is an equidigital number, since it uses as much as digits as its factorization.

72727229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 38.

The square root of 72727229 is about 8528.0260904854. The cubic root of 72727229 is about 417.4127208281.

The spelling of 72727229 in words is "seventy-two million, seven hundred twenty-seven thousand, two hundred twenty-nine".