1263938672 has 20 divisors (see below), whose sum is σ = 2577770280. Its totient is φ = 598707648.

The previous prime is 1263938659. The next prime is 1263938681. The reversal of 1263938672 is 2768393621.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2078543 + ... + 2079150.

It is an arithmetic number, because the mean of its divisors is an integer number (128888514).

Almost surely, 2^1263938672 is an apocalyptic number.

It is an amenable number.

1263938672 is an abundant number, since it is smaller than the sum of its proper divisors (1313831608).

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

1263938672 is a wasteful number, since it uses less digits than its factorization.

1263938672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157720 (or 4157714 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 1263938672 is about 35551.9151664154. The cubic root of 1263938672 is about 1081.2065482355.

The spelling of 1263938672 in words is "one billion, two hundred sixty-three million, nine hundred thirty-eight thousand, six hundred seventy-two".