28814578685 has 4 divisors (see below), whose sum is σ = 34577494428. Its totient is φ = 23051662944.

The previous prime is 28814578619. The next prime is 28814578693. The reversal of 28814578685 is 58687541882.

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 8645466361 + 20169112324 = 92981^2 + 142018^2 .

It is a cyclic number.

It is not a de Polignac number, because 28814578685 - 2¹² = 28814574589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 2881457864 + ... + 2881457873.

It is an arithmetic number, because the mean of its divisors is an integer number (8644373607).

Almost surely, 2^28814578685 is an apocalyptic number.

It is an amenable number.

28814578685 is a deficient number, since it is larger than the sum of its proper divisors (5762915743).

28814578685 is an equidigital number, since it uses as much as digits as its factorization.

28814578685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762915742.

The product of its digits is 34406400, while the sum is 62.

The spelling of 28814578685 in words is "twenty-eight billion, eight hundred fourteen million, five hundred seventy-eight thousand, six hundred eighty-five".