13728764777 has 12 divisors (see below), whose sum is σ = 17198673156. Its totient is φ = 10862318880.

The previous prime is 13728764767. The next prime is 13728764809. The reversal of 13728764777 is 77746782731.

It can be written as a sum of positive squares in 2 ways, for example, as 6002530576 + 7726234201 = 77476^2 + 87899^2 .

It is not a de Polignac number, because 13728764777 - 2¹⁸ = 13728502633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13728764767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10775474 + ... + 10776747.

It is an arithmetic number, because the mean of its divisors is an integer number (1433222763).

Almost surely, 2^13728764777 is an apocalyptic number.

It is an amenable number.

13728764777 is a deficient number, since it is larger than the sum of its proper divisors (3469908379).

13728764777 is a wasteful number, since it uses less digits than its factorization.

13728764777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21552248 (or 21552241 counting only the distinct ones).

The product of its digits is 19361664, while the sum is 59.

The spelling of 13728764777 in words is "thirteen billion, seven hundred twenty-eight million, seven hundred sixty-four thousand, seven hundred seventy-seven".