7728257533 has 2 divisors, whose sum is σ = 7728257534. Its totient is φ = 7728257532.

The previous prime is 7728257521. The next prime is 7728257539. The reversal of 7728257533 is 3357528277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5845825764 + 1882431769 = 76458^2 + 43387^2 .

It is an emirp because it is prime and its reverse (3357528277) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7728257533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7728257539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3864128766 + 3864128767.

It is an arithmetic number, because the mean of its divisors is an integer number (3864128767).

Almost surely, 2^7728257533 is an apocalyptic number.

It is an amenable number.

7728257533 is a deficient number, since it is larger than the sum of its proper divisors (1).

7728257533 is an equidigital number, since it uses as much as digits as its factorization.

7728257533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2469600, while the sum is 49.

The square root of 7728257533 is about 87910.5086607966. The cubic root of 7728257533 is about 1977.0934407987.

The spelling of 7728257533 in words is "seven billion, seven hundred twenty-eight million, two hundred fifty-seven thousand, five hundred thirty-three".