12647878 has 4 divisors (see below), whose sum is σ = 18971820. Its totient is φ = 6323938.

The previous prime is 12647849. The next prime is 12647897. The reversal of 12647878 is 87874621.

It is a semiprime because it is the product of two primes.

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 as a sum of consecutive naturals, namely, 3161968 + ... + 3161971.

It is an arithmetic number, because the mean of its divisors is an integer number (4742955).

Almost surely, 2^12647878 is an apocalyptic number.

12647878 is a deficient number, since it is larger than the sum of its proper divisors (6323942).

12647878 is an equidigital number, since it uses as much as digits as its factorization.

12647878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6323941.

The product of its digits is 150528, while the sum is 43.

The square root of 12647878 is about 3556.3855246584. The cubic root of 12647878 is about 232.9910414258.

The spelling of 12647878 in words is "twelve million, six hundred forty-seven thousand, eight hundred seventy-eight".