7728613 has 2 divisors, whose sum is σ = 7728614. Its totient is φ = 7728612.

The previous prime is 7728601. The next prime is 7728631. The reversal of 7728613 is 3168277.

Together with next prime (7728631) 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., 4848804 + 2879809 = 2202^2 + 1697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7728613 is a prime.

7728613 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7728673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3864306 + 3864307.

It is an arithmetic number, because the mean of its divisors is an integer number (3864307).

Almost surely, 2^7728613 is an apocalyptic number.

It is an amenable number.

7728613 is a deficient number, since it is larger than the sum of its proper divisors (1).

7728613 is an equidigital number, since it uses as much as digits as its factorization.

7728613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 7728613 is about 2780.0383090886. The cubic root of 7728613 is about 197.7123752966.

The spelling of 7728613 in words is "seven million, seven hundred twenty-eight thousand, six hundred thirteen".