72647437 has 2 divisors, whose sum is σ = 72647438. Its totient is φ = 72647436.

The previous prime is 72647417. The next prime is 72647453. The reversal of 72647437 is 73474627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56115081 + 16532356 = 7491^2 + 4066^2 .

It is a cyclic number.

It is not a de Polignac number, because 72647437 - 2¹¹ = 72645389 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72647437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72647417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36323718 + 36323719.

It is an arithmetic number, because the mean of its divisors is an integer number (36323719).

Almost surely, 2^72647437 is an apocalyptic number.

It is an amenable number.

72647437 is a deficient number, since it is larger than the sum of its proper divisors (1).

72647437 is an equidigital number, since it uses as much as digits as its factorization.

72647437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 40.

The square root of 72647437 is about 8523.3465845289. The cubic root of 72647437 is about 417.2600114774.

The spelling of 72647437 in words is "seventy-two million, six hundred forty-seven thousand, four hundred thirty-seven".