12807647820 has 72 divisors (see below), whose sum is σ = 42381677520. Its totient is φ = 3104883840.

The previous prime is 12807647767. The next prime is 12807647837. The reversal of 12807647820 is 2874670821.

12807647820 is a `hidden beast` number, since 12 + 80 + 76 + 478 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3232275 + ... + 3236234.

It is an arithmetic number, because the mean of its divisors is an integer number (588634410).

Almost surely, 2^12807647820 is an apocalyptic number.

12807647820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12807647820 is an abundant number, since it is smaller than the sum of its proper divisors (29574029700).

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

12807647820 is a wasteful number, since it uses less digits than its factorization.

12807647820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6468535 (or 6468530 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The spelling of 12807647820 in words is "twelve billion, eight hundred seven million, six hundred forty-seven thousand, eight hundred twenty".