12778020 has 48 divisors (see below), whose sum is σ = 39755520. Its totient is φ = 3407328.

The previous prime is 12778001. The next prime is 12778021. The reversal of 12778020 is 2087721.

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

It is not an unprimeable number, because it can be changed into a prime (12778021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11292 + ... + 12371.

It is an arithmetic number, because the mean of its divisors is an integer number (828240).

Almost surely, 2^12778020 is an apocalyptic number.

12778020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12778020 is an abundant number, since it is smaller than the sum of its proper divisors (26977500).

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

12778020 is a wasteful number, since it uses less digits than its factorization.

12778020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23681 (or 23673 counting only the distinct ones).

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

The square root of 12778020 is about 3574.6356457687. The cubic root of 12778020 is about 233.7874466969.

The spelling of 12778020 in words is "twelve million, seven hundred seventy-eight thousand, twenty".