12660780 has 48 divisors (see below), whose sum is σ = 38674944. Its totient is φ = 3069120.

The previous prime is 12660779. The next prime is 12660793. The reversal of 12660780 is 8706621.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8932 + ... + 10251.

It is an arithmetic number, because the mean of its divisors is an integer number (805728).

Almost surely, 2^12660780 is an apocalyptic number.

12660780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12660780 is an abundant number, since it is smaller than the sum of its proper divisors (26014164).

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

12660780 is a wasteful number, since it uses less digits than its factorization.

12660780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19206 (or 19204 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 12660780 is about 3558.1989826315. The cubic root of 12660780 is about 233.0702386067.

It can be divided in two parts, 126 and 60780, that added together give a palindrome (60906).

The spelling of 12660780 in words is "twelve million, six hundred sixty thousand, seven hundred eighty".