12720078 has 48 divisors (see below), whose sum is σ = 32672640. Its totient is φ = 3633336.

The previous prime is 12720077. The next prime is 12720083. The reversal of 12720078 is 87002721.

12720078 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1533 + ... + 5271.

It is an arithmetic number, because the mean of its divisors is an integer number (680680).

Almost surely, 2^12720078 is an apocalyptic number.

12720078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12720078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16336320).

12720078 is an abundant number, since it is smaller than the sum of its proper divisors (19952562).

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

12720078 is an equidigital number, since it uses as much as digits as its factorization.

12720078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3763 (or 3751 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 12720078 is about 3566.5218350656. The cubic root of 12720078 is about 233.4335410854.

Adding to 12720078 its reverse (87002721), we get a palindrome (99722799).

The spelling of 12720078 in words is "twelve million, seven hundred twenty thousand, seventy-eight".