12690326420 has 12 divisors (see below), whose sum is σ = 26649685524. Its totient is φ = 5076130560.

The previous prime is 12690326399. The next prime is 12690326431. The reversal of 12690326420 is 2462309621.

It can be written as a sum of positive squares in 2 ways, for example, as 6094612624 + 6595713796 = 78068^2 + 81214^2 .

It is a super-2 number, since 2×12690326420² (a number of 21 digits) contains 22 as substring.

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, 317258141 + ... + 317258180.

It is an arithmetic number, because the mean of its divisors is an integer number (2220807127).

Almost surely, 2^12690326420 is an apocalyptic number.

12690326420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12690326420 is an abundant number, since it is smaller than the sum of its proper divisors (13959359104).

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

12690326420 is a wasteful number, since it uses less digits than its factorization.

12690326420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634516330 (or 634516328 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 35.

The spelling of 12690326420 in words is "twelve billion, six hundred ninety million, three hundred twenty-six thousand, four hundred twenty".