12646640 has 60 divisors (see below), whose sum is σ = 31291896. Its totient is φ = 4752384.

The previous prime is 12646597. The next prime is 12646661. The reversal of 12646640 is 4664621.

It is a zygodrome in base 2.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 22847 + ... + 23393.

Almost surely, 2^12646640 is an apocalyptic number.

12646640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12646640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15645948).

12646640 is an abundant number, since it is smaller than the sum of its proper divisors (18645256).

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

12646640 is a wasteful number, since it uses less digits than its factorization.

12646640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 12646640 is about 3556.2114672781. The cubic root of 12646640 is about 232.9834392989.

The spelling of 12646640 in words is "twelve million, six hundred forty-six thousand, six hundred forty".