28931692683785 has 4 divisors (see below), whose sum is σ = 34718031220548. Its totient is φ = 23145354147024.

The previous prime is 28931692683763. The next prime is 28931692683791. The reversal of 28931692683785 is 58738629613982.

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 6188074157056 + 22743618526729 = 2487584^2 + 4769027^2 .

It is a cyclic number.

It is not a de Polignac number, because 28931692683785 - 2¹² = 28931692679689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2893169268374 + ... + 2893169268383.

It is an arithmetic number, because the mean of its divisors is an integer number (8679507805137).

Almost surely, 2^{28931692683785} is an apocalyptic number.

It is an amenable number.

28931692683785 is a deficient number, since it is larger than the sum of its proper divisors (5786338536763).

28931692683785 is an equidigital number, since it uses as much as digits as its factorization.

28931692683785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5786338536762.

The product of its digits is 1881169920, while the sum is 77.

The spelling of 28931692683785 in words is "twenty-eight trillion, nine hundred thirty-one billion, six hundred ninety-two million, six hundred eighty-three thousand, seven hundred eighty-five".