1266443028 has 18 divisors (see below), whose sum is σ = 3201286634. Its totient is φ = 422147664.

The previous prime is 1266443023. The next prime is 1266443029. The reversal of 1266443028 is 8203446621.

1266443028 is a `hidden beast` number, since 1 + 2 + 6 + 644 + 3 + 0 + 2 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 769063824 + 497379204 = 27732^2 + 22302^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 35178973 = 1266443028 / (1 + 2 + 6 + 6 + 4 + 4 + 3 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 1266442983 and 1266443001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266443023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17589451 + ... + 17589522.

Almost surely, 2^1266443028 is an apocalyptic number.

1266443028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1266443028 is an abundant number, since it is smaller than the sum of its proper divisors (1934843606).

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

1266443028 is a wasteful number, since it uses less digits than its factorization.

1266443028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35178983 (or 35178978 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 1266443028 is about 35587.1188493814. The cubic root of 1266443028 is about 1081.9201745577.

Adding to 1266443028 its reverse (8203446621), we get a palindrome (9469889649).

The spelling of 1266443028 in words is "one billion, two hundred sixty-six million, four hundred forty-three thousand, twenty-eight".