12712640 has 28 divisors (see below), whose sum is σ = 30272736. Its totient is φ = 5084928.

The previous prime is 12712627. The next prime is 12712657. The reversal of 12712640 is 4621721.

It is a super-2 number, since 2×12712640² = 323222431539200, which contains 22 as substring.

It is an unprimeable number.

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, 19544 + ... + 20183.

Almost surely, 2^12712640 is an apocalyptic number.

12712640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12712640 is an abundant number, since it is smaller than the sum of its proper divisors (17560096).

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

12712640 is an equidigital number, since it uses as much as digits as its factorization.

12712640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39744 (or 39734 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 12712640 is about 3565.4789299616. The cubic root of 12712640 is about 233.3880325276.

The spelling of 12712640 in words is "twelve million, seven hundred twelve thousand, six hundred forty".