12640428685220 has 48 divisors (see below), whose sum is σ = 30388710522240. Its totient is φ = 4326478166784.

The previous prime is 12640428685211. The next prime is 12640428685223. The reversal of 12640428685220 is 2258682404621.

It is a super-2 number, since 2×12640428685220² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12640428685223) 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, 76824785 + ... + 76989144.

It is an arithmetic number, because the mean of its divisors is an integer number (633098135880).

Almost surely, 2^{12640428685220} is an apocalyptic number.

12640428685220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12640428685220 is an abundant number, since it is smaller than the sum of its proper divisors (17748281837020).

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

12640428685220 is a wasteful number, since it uses less digits than its factorization.

12640428685220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153814532 (or 153814530 counting only the distinct ones).

The product of its (nonzero) digits is 2949120, while the sum is 50.

The spelling of 12640428685220 in words is "twelve trillion, six hundred forty billion, four hundred twenty-eight million, six hundred eighty-five thousand, two hundred twenty".