72847909 has 2 divisors, whose sum is σ = 72847910. Its totient is φ = 72847908.

The previous prime is 72847903. The next prime is 72847927. The reversal of 72847909 is 90974827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46036225 + 26811684 = 6785^2 + 5178^2 .

It is a cyclic number.

It is not a de Polignac number, because 72847909 - 2¹⁹ = 72323621 is a prime.

It is a super-3 number, since 3×72847909³ (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 (72847903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36423954 + 36423955.

It is an arithmetic number, because the mean of its divisors is an integer number (36423955).

Almost surely, 2^72847909 is an apocalyptic number.

It is an amenable number.

72847909 is a deficient number, since it is larger than the sum of its proper divisors (1).

72847909 is an equidigital number, since it uses as much as digits as its factorization.

72847909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 72847909 is about 8535.0986520368. The cubic root of 72847909 is about 417.6434713147.

The spelling of 72847909 in words is "seventy-two million, eight hundred forty-seven thousand, nine hundred nine".