1307728573 has 4 divisors (see below), whose sum is σ = 1308642588. Its totient is φ = 1306814560.

The previous prime is 1307728529. The next prime is 1307728601. The reversal of 1307728573 is 3758277031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3758277031 = 73 ⋅51483247.

It can be written as a sum of positive squares in 2 ways, for example, as 926776249 + 380952324 = 30443^2 + 19518^2 .

It is a cyclic number.

It is not a de Polignac number, because 1307728573 - 2²¹ = 1305631421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1307728073) 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 3 ways as a sum of consecutive naturals, for example, 454858 + ... + 457723.

It is an arithmetic number, because the mean of its divisors is an integer number (327160647).

Almost surely, 2^1307728573 is an apocalyptic number.

It is an amenable number.

1307728573 is a deficient number, since it is larger than the sum of its proper divisors (914015).

1307728573 is an equidigital number, since it uses as much as digits as its factorization.

1307728573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914014.

The product of its (nonzero) digits is 246960, while the sum is 43.

The square root of 1307728573 is about 36162.5299585082. The cubic root of 1307728573 is about 1093.5514085024.

The spelling of 1307728573 in words is "one billion, three hundred seven million, seven hundred twenty-eight thousand, five hundred seventy-three".