13787040644 has 24 divisors (see below), whose sum is σ = 26617011288. Its totient is φ = 6208047360.

The previous prime is 13787040643. The next prime is 13787040689. The reversal of 13787040644 is 44604078731.

It can be written as a sum of positive squares in 4 ways, for example, as 2612436544 + 11174604100 = 51112^2 + 105710^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13787040595 and 13787040604.

It is not an unprimeable number, because it can be changed into a prime (13787040643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3231227 + ... + 3235490.

It is an arithmetic number, because the mean of its divisors is an integer number (1109042137).

Almost surely, 2^13787040644 is an apocalyptic number.

It is an amenable number.

13787040644 is a deficient number, since it is larger than the sum of its proper divisors (12829970644).

13787040644 is a wasteful number, since it uses less digits than its factorization.

13787040644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6466775 (or 6466773 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 44.

The spelling of 13787040644 in words is "thirteen billion, seven hundred eighty-seven million, forty thousand, six hundred forty-four".