12688398690 has 32 divisors (see below), whose sum is σ = 33220535616. Its totient is φ = 3075975360.

The previous prime is 12688398631. The next prime is 12688398691. The reversal of 12688398690 is 9689388621.

It is a happy number.

It is a super-2 number, since 2×12688398690² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12688398691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19224517 + ... + 19225176.

It is an arithmetic number, because the mean of its divisors is an integer number (1038141738).

Almost surely, 2^12688398690 is an apocalyptic number.

12688398690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12688398690 is an abundant number, since it is smaller than the sum of its proper divisors (20532136926).

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

12688398690 is a wasteful number, since it uses less digits than its factorization.

12688398690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38449714.

The product of its (nonzero) digits is 8957952, while the sum is 60.

The spelling of 12688398690 in words is "twelve billion, six hundred eighty-eight million, three hundred ninety-eight thousand, six hundred ninety".