1272000128 has 32 divisors (see below), whose sum is σ = 2896073760. Its totient is φ = 545142528.

The previous prime is 1272000109. The next prime is 1272000137. The reversal of 1272000128 is 8210002721.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

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, 708926 + ... + 710717.

It is an arithmetic number, because the mean of its divisors is an integer number (90502305).

Almost surely, 2^1272000128 is an apocalyptic number.

It is an amenable number.

1272000128 is an abundant number, since it is smaller than the sum of its proper divisors (1624073632).

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

1272000128 is an equidigital number, since it uses as much as digits as its factorization.

1272000128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1419664 (or 1419652 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1272000128 is about 35665.1107947249. The cubic root of 1272000128 is about 1083.5003393393.

Adding to 1272000128 its reverse (8210002721), we get a palindrome (9482002849).

The spelling of 1272000128 in words is "one billion, two hundred seventy-two million, one hundred twenty-eight", and thus it is an aban number.