12978648 has 24 divisors (see below), whose sum is σ = 35150700. Its totient is φ = 4326192.

The previous prime is 12978629. The next prime is 12978659. The reversal of 12978648 is 84687921.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90058 + ... + 90201.

Almost surely, 2^12978648 is an apocalyptic number.

12978648 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12978648 is an abundant number, since it is smaller than the sum of its proper divisors (22172052).

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

12978648 is a wasteful number, since it uses less digits than its factorization.

12978648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180271 (or 180264 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 12978648 is about 3602.5890689891. The cubic root of 12978648 is about 235.0046656686.

The spelling of 12978648 in words is "twelve million, nine hundred seventy-eight thousand, six hundred forty-eight".