1273728573 has 24 divisors (see below), whose sum is σ = 2003634360. Its totient is φ = 775019520.

The previous prime is 1273728563. The next prime is 1273728581. The reversal of 1273728573 is 3758273721.

It is a happy number.

1273728573 is a `hidden beast` number, since 1 + 2 + 7 + 3 + 72 + 8 + 573 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3305124 + 1270423449 = 1818^2 + 35643^2 .

It is not a de Polignac number, because 1273728573 - 2¹² = 1273724477 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273728563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50748 + ... + 71573.

It is an arithmetic number, because the mean of its divisors is an integer number (83484765).

Almost surely, 2^1273728573 is an apocalyptic number.

1273728573 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1273728573 is a deficient number, since it is larger than the sum of its proper divisors (729905787).

1273728573 is a wasteful number, since it uses less digits than its factorization.

1273728573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122429 (or 122426 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 1273728573 is about 35689.3341630241. The cubic root of 1273728573 is about 1083.9908851805.

The spelling of 1273728573 in words is "one billion, two hundred seventy-three million, seven hundred twenty-eight thousand, five hundred seventy-three".