12870640 has 20 divisors (see below), whose sum is σ = 29924424. Its totient is φ = 5148224.

The previous prime is 12870629. The next prime is 12870647. The reversal of 12870640 is 4607821.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 12870599 and 12870608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12870647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80362 + ... + 80521.

Almost surely, 2^12870640 is an apocalyptic number.

12870640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12870640 is an abundant number, since it is smaller than the sum of its proper divisors (17053784).

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

12870640 is a wasteful number, since it uses less digits than its factorization.

12870640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160896 (or 160890 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 12870640 is about 3587.5674209693. The cubic root of 12870640 is about 234.3509478133.

The spelling of 12870640 in words is "twelve million, eight hundred seventy thousand, six hundred forty".