28343338685 has 4 divisors (see below), whose sum is σ = 34012006428. Its totient is φ = 22674670944.

The previous prime is 28343338669. The next prime is 28343338691. The reversal of 28343338685 is 58683334382.

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 18139510489 + 10203828196 = 134683^2 + 101014^2 .

It is a cyclic number.

It is not a de Polignac number, because 28343338685 - 2⁴ = 28343338669 is a prime.

It is a Duffinian 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, 2834333864 + ... + 2834333873.

It is an arithmetic number, because the mean of its divisors is an integer number (8503001607).

Almost surely, 2^28343338685 is an apocalyptic number.

It is an amenable number.

28343338685 is a deficient number, since it is larger than the sum of its proper divisors (5668667743).

28343338685 is an equidigital number, since it uses as much as digits as its factorization.

28343338685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5668667742.

The product of its digits is 9953280, while the sum is 53.

The spelling of 28343338685 in words is "twenty-eight billion, three hundred forty-three million, three hundred thirty-eight thousand, six hundred eighty-five".