1263680738 has 4 divisors (see below), whose sum is σ = 1895521110. Its totient is φ = 631840368.

The previous prime is 1263680729. The next prime is 1263680741. The reversal of 1263680738 is 8370863621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 728082289 + 535598449 = 26983^2 + 23143^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315920183 + ... + 315920186.

Almost surely, 2^1263680738 is an apocalyptic number.

1263680738 is a deficient number, since it is larger than the sum of its proper divisors (631840372).

1263680738 is an equidigital number, since it uses as much as digits as its factorization.

1263680738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631840371.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 1263680738 is about 35548.2874130386. The cubic root of 1263680738 is about 1081.1329953781.

The spelling of 1263680738 in words is "one billion, two hundred sixty-three million, six hundred eighty thousand, seven hundred thirty-eight".