12778740 has 144 divisors (see below), whose sum is σ = 43051008. Its totient is φ = 3048192.

The previous prime is 12778729. The next prime is 12778741. The reversal of 12778740 is 4787721.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 12778695 and 12778704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778741) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 100557 + ... + 100683.

Almost surely, 2^12778740 is an apocalyptic number.

12778740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12778740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21525504).

12778740 is an abundant number, since it is smaller than the sum of its proper divisors (30272268).

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

12778740 is a wasteful number, since it uses less digits than its factorization.

12778740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 12778740 is about 3574.7363539148. The cubic root of 12778740 is about 233.7918376693.

The spelling of 12778740 in words is "twelve million, seven hundred seventy-eight thousand, seven hundred forty".