28705845133055 has 4 divisors (see below), whose sum is σ = 34447014159672. Its totient is φ = 22964676106440.

The previous prime is 28705845133033. The next prime is 28705845133057. The reversal of 28705845133055 is 55033154850782.

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

It is not a de Polignac number, because 28705845133055 - 2¹⁰ = 28705845132031 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 (28705845133057) 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, 2870584513301 + ... + 2870584513310.

It is an arithmetic number, because the mean of its divisors is an integer number (8611753539918).

Almost surely, 2^{28705845133055} is an apocalyptic number.

28705845133055 is a deficient number, since it is larger than the sum of its proper divisors (5741169026617).

28705845133055 is an equidigital number, since it uses as much as digits as its factorization.

28705845133055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5741169026616.

The product of its (nonzero) digits is 20160000, while the sum is 56.

The spelling of 28705845133055 in words is "twenty-eight trillion, seven hundred five billion, eight hundred forty-five million, one hundred thirty-three thousand, fifty-five".