12778650 has 72 divisors (see below), whose sum is σ = 34891740. Its totient is φ = 3352320.

The previous prime is 12778643. The next prime is 12778681. The reversal of 12778650 is 5687721.

It can be written as a sum of positive squares in 6 ways, for example, as 3359889 + 9418761 = 1833^2 + 3069^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 32656 + ... + 33044.

Almost surely, 2^12778650 is an apocalyptic number.

12778650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12778650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17445870).

12778650 is an abundant number, since it is smaller than the sum of its proper divisors (22113090).

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

12778650 is a wasteful number, since it uses less digits than its factorization.

12778650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 12778650 is about 3574.7237655517. The cubic root of 12778650 is about 233.7912888068.

The spelling of 12778650 in words is "twelve million, seven hundred seventy-eight thousand, six hundred fifty".