12640280008 has 32 divisors (see below), whose sum is σ = 24471936000. Its totient is φ = 6114545280.

The previous prime is 12640279999. The next prime is 12640280017. The reversal of 12640280008 is 80008204621.

It is an interprime number because it is at equal distance from previous prime (12640279999) and next prime (12640280017).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1625233 + ... + 1632991.

It is an arithmetic number, because the mean of its divisors is an integer number (764748000).

Almost surely, 2^12640280008 is an apocalyptic number.

It is an amenable number.

12640280008 is a deficient number, since it is larger than the sum of its proper divisors (11831655992).

12640280008 is a wasteful number, since it uses less digits than its factorization.

12640280008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14365 (or 14361 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

Adding to 12640280008 its reverse (80008204621), we get a palindrome (92648484629).

The spelling of 12640280008 in words is "twelve billion, six hundred forty million, two hundred eighty thousand, eight".