28075072789 has 4 divisors (see below), whose sum is σ = 28075747756. Its totient is φ = 28074397824.

The previous prime is 28075072777. The next prime is 28075072867. The reversal of 28075072789 is 98727057082.

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 6220476900 + 21854595889 = 78870^2 + 147833^2 .

It is a cyclic number.

It is not a de Polignac number, because 28075072789 - 2⁵ = 28075072757 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 (28075075789) 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, 270684 + ... + 359749.

It is an arithmetic number, because the mean of its divisors is an integer number (7018936939).

Almost surely, 2^28075072789 is an apocalyptic number.

It is an amenable number.

28075072789 is a deficient number, since it is larger than the sum of its proper divisors (674967).

28075072789 is an equidigital number, since it uses as much as digits as its factorization.

28075072789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674966.

The product of its (nonzero) digits is 3951360, while the sum is 55.

The spelling of 28075072789 in words is "twenty-eight billion, seventy-five million, seventy-two thousand, seven hundred eighty-nine".