12978624 has 56 divisors (see below), whose sum is σ = 35844480. Its totient is φ = 4136704.

The previous prime is 12978619. The next prime is 12978629. The reversal of 12978624 is 42687921.

It is an interprime number because it is at equal distance from previous prime (12978619) and next prime (12978629).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2947 + ... + 5885.

It is an arithmetic number, because the mean of its divisors is an integer number (640080).

Almost surely, 2^12978624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12978624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17922240).

12978624 is an abundant number, since it is smaller than the sum of its proper divisors (22865856).

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

12978624 is a wasteful number, since it uses less digits than its factorization.

12978624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977 (or 2967 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 12978624 is about 3602.5857380498. The cubic root of 12978624 is about 235.0045208124.

The spelling of 12978624 in words is "twelve million, nine hundred seventy-eight thousand, six hundred twenty-four".