12861578 has 8 divisors (see below), whose sum is σ = 19556868. Its totient is φ = 6342624.

The previous prime is 12861557. The next prime is 12861581. The reversal of 12861578 is 87516821.

It can be written as a sum of positive squares in 2 ways, for example, as 11744329 + 1117249 = 3427^2 + 1057^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43901 + ... + 44192.

Almost surely, 2^12861578 is an apocalyptic number.

12861578 is a deficient number, since it is larger than the sum of its proper divisors (6695290).

12861578 is an equidigital number, since it uses as much as digits as its factorization.

12861578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88168.

The product of its digits is 26880, while the sum is 38.

The square root of 12861578 is about 3586.3042258013. The cubic root of 12861578 is about 234.2959340532.

The spelling of 12861578 in words is "twelve million, eight hundred sixty-one thousand, five hundred seventy-eight".