72728039 has 2 divisors, whose sum is σ = 72728040. Its totient is φ = 72728038.

The previous prime is 72728011. The next prime is 72728053. The reversal of 72728039 is 93082727.

It is a strong prime.

It is an emirp because it is prime and its reverse (93082727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72728039 - 2²⁴ = 55950823 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 72727993 and 72728011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72728059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36364019 + 36364020.

It is an arithmetic number, because the mean of its divisors is an integer number (36364020).

Almost surely, 2^72728039 is an apocalyptic number.

72728039 is a deficient number, since it is larger than the sum of its proper divisors (1).

72728039 is an equidigital number, since it uses as much as digits as its factorization.

72728039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 72728039 is about 8528.0735808270. The cubic root of 72728039 is about 417.4142704681.

The spelling of 72728039 in words is "seventy-two million, seven hundred twenty-eight thousand, thirty-nine".