28955786897 has 4 divisors (see below), whose sum is σ = 28956146100. Its totient is φ = 28955427696.

The previous prime is 28955786833. The next prime is 28955786903. The reversal of 28955786897 is 79868755982.

It is a Cunningham number, because it is equal to 170164²+1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12450989056 + 16504797841 = 111584^2 + 128471^2 .

It is a cyclic number.

It is not a de Polignac number, because 28955786897 - 2⁶ = 28955786833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28955780897) 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, 3623 + ... + 240675.

It is an arithmetic number, because the mean of its divisors is an integer number (7239036525).

Almost surely, 2^28955786897 is an apocalyptic number.

It is an amenable number.

28955786897 is a deficient number, since it is larger than the sum of its proper divisors (359203).

28955786897 is a wasteful number, since it uses less digits than its factorization.

28955786897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359202.

The product of its digits is 609638400, while the sum is 74.

The spelling of 28955786897 in words is "twenty-eight billion, nine hundred fifty-five million, seven hundred eighty-six thousand, eight hundred ninety-seven".