7728988113549 has 6 divisors (see below), whose sum is σ = 11164093941806. Its totient is φ = 5152658742360.

The previous prime is 7728988113499. The next prime is 7728988113589. The reversal of 7728988113549 is 9453118898277.

7728988113549 is a `hidden beast` number, since 7 + 72 + 8 + 9 + 8 + 8 + 1 + 1 + 3 + 549 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7530183597924 + 198804515625 = 2744118^2 + 445875^2 .

It is not a de Polignac number, because 7728988113549 - 2¹¹ = 7728988111501 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 (7728988113589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 429388228522 + ... + 429388228539.

Almost surely, 2^{7728988113549} is an apocalyptic number.

It is an amenable number.

7728988113549 is a deficient number, since it is larger than the sum of its proper divisors (3435105828257).

7728988113549 is a wasteful number, since it uses less digits than its factorization.

7728988113549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858776457067 (or 858776457064 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 72.

The spelling of 7728988113549 in words is "seven trillion, seven hundred twenty-eight billion, nine hundred eighty-eight million, one hundred thirteen thousand, five hundred forty-nine".