12786640038 has 24 divisors (see below), whose sum is σ = 28659711600. Its totient is φ = 4115240304.

The previous prime is 12786640021. The next prime is 12786640073. The reversal of 12786640038 is 83004668721.

It is a super-2 number, since 2×12786640038² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12786639975 and 12786640002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12247218 + ... + 12248261.

It is an arithmetic number, because the mean of its divisors is an integer number (1194154650).

Almost surely, 2^12786640038 is an apocalyptic number.

12786640038 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12786640038 is an abundant number, since it is smaller than the sum of its proper divisors (15873071562).

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

12786640038 is a wasteful number, since it uses less digits than its factorization.

12786640038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24495516 (or 24495513 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 12786640038 in words is "twelve billion, seven hundred eighty-six million, six hundred forty thousand, thirty-eight".