12643550 has 24 divisors (see below), whose sum is σ = 24756600. Its totient is φ = 4790880.

The previous prime is 12643549. The next prime is 12643571. The reversal of 12643550 is 5534621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5705 + ... + 7604.

It is an arithmetic number, because the mean of its divisors is an integer number (1031525).

Almost surely, 2^12643550 is an apocalyptic number.

12643550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12643550 is a deficient number, since it is larger than the sum of its proper divisors (12113050).

12643550 is a wasteful number, since it uses less digits than its factorization.

12643550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13340 (or 13335 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 12643550 is about 3555.7769896325. The cubic root of 12643550 is about 232.9644625201.

The spelling of 12643550 in words is "twelve million, six hundred forty-three thousand, five hundred fifty".