28693898197 has 4 divisors (see below), whose sum is σ = 28694273760. Its totient is φ = 28693522636.

The previous prime is 28693898161. The next prime is 28693898201. The reversal of 28693898197 is 79189839682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28693898197 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 (28693898117) 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, 27673 + ... + 241150.

It is an arithmetic number, because the mean of its divisors is an integer number (7173568440).

Almost surely, 2^28693898197 is an apocalyptic number.

It is an amenable number.

28693898197 is a deficient number, since it is larger than the sum of its proper divisors (375563).

28693898197 is a wasteful number, since it uses less digits than its factorization.

28693898197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375562.

The product of its digits is 94058496, while the sum is 70.

The spelling of 28693898197 in words is "twenty-eight billion, six hundred ninety-three million, eight hundred ninety-eight thousand, one hundred ninety-seven".