13777787640 has 32 divisors (see below), whose sum is σ = 41333363280. Its totient is φ = 3674076672.

The previous prime is 13777787629. The next prime is 13777787671. The reversal of 13777787640 is 4678777731.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57407329 + ... + 57407568.

Almost surely, 2^13777787640 is an apocalyptic number.

13777787640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13777787640 is an abundant number, since it is smaller than the sum of its proper divisors (27555575640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13777787640 is a wasteful number, since it uses less digits than its factorization.

13777787640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114814911 (or 114814907 counting only the distinct ones).

The product of its (nonzero) digits is 9680832, while the sum is 57.

Subtracting from 13777787640 its reverse (4678777731), we obtain a palindrome (9099009909).

The spelling of 13777787640 in words is "thirteen billion, seven hundred seventy-seven million, seven hundred eighty-seven thousand, six hundred forty".