28768657837 has 4 divisors (see below), whose sum is σ = 28845785980. Its totient is φ = 28691529696.

The previous prime is 28768657823. The next prime is 28768657843. The reversal of 28768657837 is 73875686782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73875686782 = 2 ⋅36937843391.

It can be written as a sum of positive squares in 2 ways, for example, as 14996696521 + 13771961316 = 122461^2 + 117354^2 .

It is a cyclic number.

It is not a de Polignac number, because 28768657837 - 2¹⁹ = 28768133549 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 (28768657817) 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, 38563512 + ... + 38564257.

It is an arithmetic number, because the mean of its divisors is an integer number (7211446495).

Almost surely, 2^28768657837 is an apocalyptic number.

It is an amenable number.

28768657837 is a deficient number, since it is larger than the sum of its proper divisors (77128143).

28768657837 is an equidigital number, since it uses as much as digits as its factorization.

28768657837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77128142.

The product of its digits is 189665280, while the sum is 67.

The spelling of 28768657837 in words is "twenty-eight billion, seven hundred sixty-eight million, six hundred fifty-seven thousand, eight hundred thirty-seven".