1272028555 has 8 divisors (see below), whose sum is σ = 1744496352. Its totient is φ = 872248128.

The previous prime is 1272028543. The next prime is 1272028559. The reversal of 1272028555 is 5558202721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1272028555 - 2⁷ = 1272028427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1272028559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18171802 + ... + 18171871.

It is an arithmetic number, because the mean of its divisors is an integer number (218062044).

Almost surely, 2^1272028555 is an apocalyptic number.

1272028555 is a deficient number, since it is larger than the sum of its proper divisors (472467797).

1272028555 is an equidigital number, since it uses as much as digits as its factorization.

1272028555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36343685.

The product of its (nonzero) digits is 56000, while the sum is 37.

The square root of 1272028555 is about 35665.5093192289. The cubic root of 1272028555 is about 1083.5084107312.

The spelling of 1272028555 in words is "one billion, two hundred seventy-two million, twenty-eight thousand, five hundred fifty-five".