1263316544 has 28 divisors (see below), whose sum is σ = 2865022464. Its totient is φ = 541421184.

The previous prime is 1263316519. The next prime is 1263316547. The reversal of 1263316544 is 4456133621.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (1263316547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1409504 + ... + 1410399.

Almost surely, 2^1263316544 is an apocalyptic number.

1263316544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1263316544 is an abundant number, since it is smaller than the sum of its proper divisors (1601705920).

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

1263316544 is an equidigital number, since it uses as much as digits as its factorization.

1263316544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819922 (or 2819912 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 1263316544 is about 35543.1645186525. The cubic root of 1263316544 is about 1081.0291242104.

The spelling of 1263316544 in words is "one billion, two hundred sixty-three million, three hundred sixteen thousand, five hundred forty-four".