28787858005 has 4 divisors (see below), whose sum is σ = 34545429612. Its totient is φ = 23030286400.

The previous prime is 28787858003. The next prime is 28787858009. The reversal of 28787858005 is 50085878782.

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 10550165796 + 18237692209 = 102714^2 + 135047^2 .

It is not a de Polignac number, because 28787858005 - 2¹ = 28787858003 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 (28787858003) 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, 2878785796 + ... + 2878785805.

It is an arithmetic number, because the mean of its divisors is an integer number (8636357403).

Almost surely, 2^28787858005 is an apocalyptic number.

It is an amenable number.

28787858005 is a deficient number, since it is larger than the sum of its proper divisors (5757571607).

28787858005 is an equidigital number, since it uses as much as digits as its factorization.

28787858005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5757571606.

The product of its (nonzero) digits is 10035200, while the sum is 58.

The spelling of 28787858005 in words is "twenty-eight billion, seven hundred eighty-seven million, eight hundred fifty-eight thousand, five".