72839797 has 2 divisors, whose sum is σ = 72839798. Its totient is φ = 72839796.

The previous prime is 72839783. The next prime is 72839831. The reversal of 72839797 is 79793827.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71216721 + 1623076 = 8439^2 + 1274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72839797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72839737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36419898 + 36419899.

It is an arithmetic number, because the mean of its divisors is an integer number (36419899).

Almost surely, 2^72839797 is an apocalyptic number.

It is an amenable number.

72839797 is a deficient number, since it is larger than the sum of its proper divisors (1).

72839797 is an equidigital number, since it uses as much as digits as its factorization.

72839797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 52.

The square root of 72839797 is about 8534.6234246158. The cubic root of 72839797 is about 417.6279684694.

The spelling of 72839797 in words is "seventy-two million, eight hundred thirty-nine thousand, seven hundred ninety-seven".