13005720688 has 10 divisors (see below), whose sum is σ = 25198583864. Its totient is φ = 6502860336.

The previous prime is 13005720653. The next prime is 13005720701. The reversal of 13005720688 is 88602750031.

It is a super-2 number, since 2×13005720688² (a number of 21 digits) contains 22 as substring.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 13005720688.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406428756 + ... + 406428787.

Almost surely, 2^13005720688 is an apocalyptic number.

It is an amenable number.

13005720688 is a deficient number, since it is larger than the sum of its proper divisors (12192863176).

13005720688 is an equidigital number, since it uses as much as digits as its factorization.

13005720688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812857551 (or 812857545 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 13005720688 in words is "thirteen billion, five million, seven hundred twenty thousand, six hundred eighty-eight".