1271865472 has 64 divisors (see below), whose sum is σ = 2824135200. Its totient is φ = 567005184.

The previous prime is 1271865457. The next prime is 1271865479. The reversal of 1271865472 is 2745681721.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1271865479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25963 + ... + 56725.

Almost surely, 2^1271865472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1271865472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1412067600).

1271865472 is an abundant number, since it is smaller than the sum of its proper divisors (1552269728).

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

1271865472 is a wasteful number, since it uses less digits than its factorization.

1271865472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30813 (or 30801 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 1271865472 is about 35663.2229614767. Note that the first 3 decimals coincide. The cubic root of 1271865472 is about 1083.4621042880.

The spelling of 1271865472 in words is "one billion, two hundred seventy-one million, eight hundred sixty-five thousand, four hundred seventy-two".