28728857171603 has 4 divisors (see below), whose sum is σ = 29157646084680. Its totient is φ = 28300068258528.

The previous prime is 28728857171557. The next prime is 28728857171653. The reversal of 28728857171603 is 30617175882782.

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

It is a cyclic number.

It is not a de Polignac number, because 28728857171603 - 2³² = 28724562204307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28728857171603.

It is not an unprimeable number, because it can be changed into a prime (28728857171653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214394456438 + ... + 214394456571.

It is an arithmetic number, because the mean of its divisors is an integer number (7289411521170).

Almost surely, 2^{28728857171603} is an apocalyptic number.

28728857171603 is a deficient number, since it is larger than the sum of its proper divisors (428788913077).

28728857171603 is an equidigital number, since it uses as much as digits as its factorization.

28728857171603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428788913076.

The product of its (nonzero) digits is 63221760, while the sum is 65.

The spelling of 28728857171603 in words is "twenty-eight trillion, seven hundred twenty-eight billion, eight hundred fifty-seven million, one hundred seventy-one thousand, six hundred three".