1266100444 has 48 divisors (see below), whose sum is σ = 2623884480. Its totient is φ = 523031040.

The previous prime is 1266100441. The next prime is 1266100453. The reversal of 1266100444 is 4440016621.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266100441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 763264 + ... + 764920.

It is an arithmetic number, because the mean of its divisors is an integer number (54664260).

Almost surely, 2^1266100444 is an apocalyptic number.

1266100444 is a gapful number since it is divisible by the number (14) 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 1266100444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1311942240).

1266100444 is an abundant number, since it is smaller than the sum of its proper divisors (1357784036).

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

1266100444 is a wasteful number, since it uses less digits than its factorization.

1266100444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638 (or 2636 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1266100444 is about 35582.3052091907. The cubic root of 1266100444 is about 1081.8226094458.

The spelling of 1266100444 in words is "one billion, two hundred sixty-six million, one hundred thousand, four hundred forty-four".