7728705505549 has 4 divisors (see below), whose sum is σ = 8832806292064. Its totient is φ = 6624604719036.

The previous prime is 7728705505511. The next prime is 7728705505553. The reversal of 7728705505549 is 9455055078277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7728705505549 - 2¹⁷ = 7728705374477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7728705506549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552050393247 + ... + 552050393260.

It is an arithmetic number, because the mean of its divisors is an integer number (2208201573016).

Almost surely, 2^{7728705505549} is an apocalyptic number.

It is an amenable number.

7728705505549 is a deficient number, since it is larger than the sum of its proper divisors (1104100786515).

7728705505549 is a wasteful number, since it uses less digits than its factorization.

7728705505549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104100786514.

The product of its (nonzero) digits is 123480000, while the sum is 64.

The spelling of 7728705505549 in words is "seven trillion, seven hundred twenty-eight billion, seven hundred five million, five hundred five thousand, five hundred forty-nine".