1728808453 has 4 divisors (see below), whose sum is σ = 1728936108. Its totient is φ = 1728680800.

The previous prime is 1728808397. The next prime is 1728808463. The reversal of 1728808453 is 3548088271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1124730369 + 604078084 = 33537^2 + 24578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1728808453 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 (1728808463) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 40726 + ... + 71527.

It is an arithmetic number, because the mean of its divisors is an integer number (432234027).

Almost surely, 2^1728808453 is an apocalyptic number.

It is an amenable number.

1728808453 is a deficient number, since it is larger than the sum of its proper divisors (127655).

1728808453 is a wasteful number, since it uses less digits than its factorization.

1728808453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127654.

The product of its (nonzero) digits is 430080, while the sum is 46.

The square root of 1728808453 is about 41578.9424228178. The cubic root of 1728808453 is about 1200.1871127207.

The spelling of 1728808453 in words is "one billion, seven hundred twenty-eight million, eight hundred eight thousand, four hundred fifty-three".