28061234785 has 4 divisors (see below), whose sum is σ = 33673481748. Its totient is φ = 22448987824.

The previous prime is 28061234779. The next prime is 28061234827. The reversal of 28061234785 is 58743216082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58743216082 = 2 ⋅29371608041.

It can be written as a sum of positive squares in 2 ways, for example, as 15515442721 + 12545792064 = 124561^2 + 112008^2 .

It is a cyclic number.

It is not a de Polignac number, because 28061234785 - 2³ = 28061234777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2806123474 + ... + 2806123483.

It is an arithmetic number, because the mean of its divisors is an integer number (8418370437).

Almost surely, 2^28061234785 is an apocalyptic number.

It is an amenable number.

28061234785 is a deficient number, since it is larger than the sum of its proper divisors (5612246963).

28061234785 is an equidigital number, since it uses as much as digits as its factorization.

28061234785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612246962.

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 28061234785 in words is "twenty-eight billion, sixty-one million, two hundred thirty-four thousand, seven hundred eighty-five".