1272031328 has 12 divisors (see below), whose sum is σ = 2504311740. Its totient is φ = 636015648.

The previous prime is 1272031303. The next prime is 1272031331. The reversal of 1272031328 is 8231302721.

It is a self number, because there is not a number n which added to its sum of digits gives 1272031328.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 19875458 + ... + 19875521.

It is an arithmetic number, because the mean of its divisors is an integer number (208692645).

Almost surely, 2^1272031328 is an apocalyptic number.

It is an amenable number.

1272031328 is a deficient number, since it is larger than the sum of its proper divisors (1232280412).

1272031328 is an equidigital number, since it uses as much as digits as its factorization.

1272031328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39750989 (or 39750981 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 1272031328 is about 35665.5481943009. The cubic root of 1272031328 is about 1083.5091980737.

The spelling of 1272031328 in words is "one billion, two hundred seventy-two million, thirty-one thousand, three hundred twenty-eight".