12917781628 has 12 divisors (see below), whose sum is σ = 22829941512. Its totient is φ = 6394941200.

The previous prime is 12917781601. The next prime is 12917781647. The reversal of 12917781628 is 82618771921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15986950 + ... + 15987757.

It is an arithmetic number, because the mean of its divisors is an integer number (1902495126).

Almost surely, 2^12917781628 is an apocalyptic number.

It is an amenable number.

12917781628 is a deficient number, since it is larger than the sum of its proper divisors (9912159884).

12917781628 is a wasteful number, since it uses less digits than its factorization.

12917781628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31974812 (or 31974810 counting only the distinct ones).

The product of its digits is 677376, while the sum is 52.

The spelling of 12917781628 in words is "twelve billion, nine hundred seventeen million, seven hundred eighty-one thousand, six hundred twenty-eight".