72603613 has 2 divisors, whose sum is σ = 72603614. Its totient is φ = 72603612.

The previous prime is 72603599. The next prime is 72603631. The reversal of 72603613 is 31630627.

Together with next prime (72603631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59259204 + 13344409 = 7698^2 + 3653^2 .

It is a cyclic number.

It is not a de Polignac number, because 72603613 - 2⁹ = 72603101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72600613) 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, 36301806 + 36301807.

It is an arithmetic number, because the mean of its divisors is an integer number (36301807).

Almost surely, 2^72603613 is an apocalyptic number.

It is an amenable number.

72603613 is a deficient number, since it is larger than the sum of its proper divisors (1).

72603613 is an equidigital number, since it uses as much as digits as its factorization.

72603613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 72603613 is about 8520.7753755160. The cubic root of 72603613 is about 417.1760916508.

The spelling of 72603613 in words is "seventy-two million, six hundred three thousand, six hundred thirteen".