12787720 has 32 divisors (see below), whose sum is σ = 31389120. Its totient is φ = 4649920.

The previous prime is 12787693. The next prime is 12787721. The reversal of 12787720 is 2778721.

It is not an unprimeable number, because it can be changed into a prime (12787721) 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, 14092 + ... + 14971.

It is an arithmetic number, because the mean of its divisors is an integer number (980910).

Almost surely, 2^12787720 is an apocalyptic number.

12787720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12787720 is an abundant number, since it is smaller than the sum of its proper divisors (18601400).

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

12787720 is a wasteful number, since it uses less digits than its factorization.

12787720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29085 (or 29081 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 12787720 is about 3575.9921700138. The cubic root of 12787720 is about 233.8465890014.

It can be divided in two parts, 1278 and 7720, that added together give a palindrome (8998).

The spelling of 12787720 in words is "twelve million, seven hundred eighty-seven thousand, seven hundred twenty".