72608021 has 2 divisors, whose sum is σ = 72608022. Its totient is φ = 72608020.

The previous prime is 72608009. The next prime is 72608027. The reversal of 72608021 is 12080627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 20566225 = 7214^2 + 4535^2 .

It is a cyclic number.

It is not a de Polignac number, because 72608021 - 2⁶ = 72607957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72608027) 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, 36304010 + 36304011.

It is an arithmetic number, because the mean of its divisors is an integer number (36304011).

Almost surely, 2^72608021 is an apocalyptic number.

It is an amenable number.

72608021 is a deficient number, since it is larger than the sum of its proper divisors (1).

72608021 is an equidigital number, since it uses as much as digits as its factorization.

72608021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 72608021 is about 8521.0340334962. The cubic root of 72608021 is about 417.1845341829.

Adding to 72608021 its reverse (12080627), we get a palindrome (84688648).

The spelling of 72608021 in words is "seventy-two million, six hundred eight thousand, twenty-one".