1271232872 has 144 divisors (see below), whose sum is σ = 3104265600. Its totient is φ = 485896320.

The previous prime is 1271232871. The next prime is 1271232889. The reversal of 1271232872 is 2782321721.

Its product of digits (18816) is a multiple of the sum of its prime divisors (672).

It is not an unprimeable number, because it can be changed into a prime (1271232871) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2053379 + ... + 2053997.

It is an arithmetic number, because the mean of its divisors is an integer number (21557400).

Almost surely, 2^1271232872 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 1271232872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552132800).

1271232872 is an abundant number, since it is smaller than the sum of its proper divisors (1833032728).

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

1271232872 is a wasteful number, since it uses less digits than its factorization.

1271232872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 672 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 1271232872 is about 35654.3527777465. The cubic root of 1271232872 is about 1083.2824438317.

The spelling of 1271232872 in words is "one billion, two hundred seventy-one million, two hundred thirty-two thousand, eight hundred seventy-two".