28768406705 has 4 divisors (see below), whose sum is σ = 34522088052. Its totient is φ = 23014725360.

The previous prime is 28768406701. The next prime is 28768406789. The reversal of 28768406705 is 50760486782.

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 21410712976 + 7357693729 = 146324^2 + 85777^2 .

It is not a de Polignac number, because 28768406705 - 2² = 28768406701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28768406701) 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, 2876840666 + ... + 2876840675.

It is an arithmetic number, because the mean of its divisors is an integer number (8630522013).

Almost surely, 2^28768406705 is an apocalyptic number.

It is an amenable number.

28768406705 is a deficient number, since it is larger than the sum of its proper divisors (5753681347).

28768406705 is an equidigital number, since it uses as much as digits as its factorization.

28768406705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5753681346.

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 28768406705 in words is "twenty-eight billion, seven hundred sixty-eight million, four hundred six thousand, seven hundred five".