1266568728 has 64 divisors (see below), whose sum is σ = 3339360000. Its totient is φ = 399215232.

The previous prime is 1266568727. The next prime is 1266568729. The reversal of 1266568728 is 8278656621.

It is a happy number.

1266568728 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1266568727) and next prime (1266568729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266568727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270826 + ... + 275462.

It is an arithmetic number, because the mean of its divisors is an integer number (52177500).

Almost surely, 2^1266568728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1266568728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1669680000).

1266568728 is an abundant number, since it is smaller than the sum of its proper divisors (2072791272).

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

1266568728 is a wasteful number, since it uses less digits than its factorization.

1266568728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5264 (or 5260 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 51.

The square root of 1266568728 is about 35588.8848940227. The cubic root of 1266568728 is about 1081.9559684739.

The spelling of 1266568728 in words is "one billion, two hundred sixty-six million, five hundred sixty-eight thousand, seven hundred twenty-eight".