28693872797 has 4 divisors (see below), whose sum is σ = 28876636476. Its totient is φ = 28511109120.

The previous prime is 28693872787. The next prime is 28693872811. The reversal of 28693872797 is 79727839682.

It is a happy number.

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 4479089476 + 24214783321 = 66926^2 + 155611^2 .

It is a cyclic number.

It is not a de Polignac number, because 28693872797 - 2¹⁴ = 28693856413 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 (28693872787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91381604 + ... + 91381917.

It is an arithmetic number, because the mean of its divisors is an integer number (7219159119).

Almost surely, 2^28693872797 is an apocalyptic number.

It is an amenable number.

28693872797 is a deficient number, since it is larger than the sum of its proper divisors (182763679).

28693872797 is a wasteful number, since it uses less digits than its factorization.

28693872797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182763678.

The product of its digits is 128024064, while the sum is 68.

The spelling of 28693872797 in words is "twenty-eight billion, six hundred ninety-three million, eight hundred seventy-two thousand, seven hundred ninety-seven".