1272628345 has 16 divisors (see below), whose sum is σ = 1563149952. Its totient is φ = 994377600.

The previous prime is 1272628321. The next prime is 1272628349. The reversal of 1272628345 is 5438262721.

It is not a de Polignac number, because 1272628345 - 2¹¹ = 1272626297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1272628298 and 1272628307.

It is not an unprimeable number, because it can be changed into a prime (1272628349) 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 15 ways as a sum of consecutive naturals, for example, 20670 + ... + 54520.

It is an arithmetic number, because the mean of its divisors is an integer number (97696872).

Almost surely, 2^1272628345 is an apocalyptic number.

It is an amenable number.

1272628345 is a deficient number, since it is larger than the sum of its proper divisors (290521607).

1272628345 is a wasteful number, since it uses less digits than its factorization.

1272628345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34032.

The product of its digits is 161280, while the sum is 40.

The square root of 1272628345 is about 35673.9168721350. The cubic root of 1272628345 is about 1083.6786834791.

The spelling of 1272628345 in words is "one billion, two hundred seventy-two million, six hundred twenty-eight thousand, three hundred forty-five".