72815443 has 2 divisors, whose sum is σ = 72815444. Its totient is φ = 72815442.

The previous prime is 72815441. The next prime is 72815459. The reversal of 72815443 is 34451827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72815443 - 2¹ = 72815441 is a prime.

Together with 72815441, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 72815399 and 72815408.

It is not a weakly prime, because it can be changed into another prime (72815441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36407721 + 36407722.

It is an arithmetic number, because the mean of its divisors is an integer number (36407722).

Almost surely, 2^72815443 is an apocalyptic number.

72815443 is a deficient number, since it is larger than the sum of its proper divisors (1).

72815443 is an equidigital number, since it uses as much as digits as its factorization.

72815443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 34.

The square root of 72815443 is about 8533.1965288513. The cubic root of 72815443 is about 417.5814186174.

The spelling of 72815443 in words is "seventy-two million, eight hundred fifteen thousand, four hundred forty-three".