1266623604 has 36 divisors (see below), whose sum is σ = 3312150660. Its totient is φ = 407648640.

The previous prime is 1266623597. The next prime is 1266623647. The reversal of 1266623604 is 4063266621.

It can be written as a sum of positive squares in 2 ways, for example, as 523952100 + 742671504 = 22890^2 + 27252^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 605577 + ... + 607664.

It is an arithmetic number, because the mean of its divisors is an integer number (92004185).

Almost surely, 2^1266623604 is an apocalyptic number.

It is an amenable number.

1266623604 is an abundant number, since it is smaller than the sum of its proper divisors (2045527056).

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

1266623604 is a wasteful number, since it uses less digits than its factorization.

1266623604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213280 (or 1213275 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 1266623604 is about 35589.6558567233. The cubic root of 1266623604 is about 1081.9715940395.

The spelling of 1266623604 in words is "one billion, two hundred sixty-six million, six hundred twenty-three thousand, six hundred four".