28978900289 has 4 divisors (see below), whose sum is σ = 29008143360. Its totient is φ = 28949657220.

The previous prime is 28978900273. The next prime is 28978900333. The reversal of 28978900289 is 98200987982.

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.

It is a cyclic number.

It is not a de Polignac number, because 28978900289 - 2⁴ = 28978900273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28978900219) 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, 14620049 + ... + 14622030.

It is an arithmetic number, because the mean of its divisors is an integer number (7252035840).

Almost surely, 2^28978900289 is an apocalyptic number.

It is an amenable number.

28978900289 is a deficient number, since it is larger than the sum of its proper divisors (29243071).

28978900289 is an equidigital number, since it uses as much as digits as its factorization.

28978900289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29243070.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The spelling of 28978900289 in words is "twenty-eight billion, nine hundred seventy-eight million, nine hundred thousand, two hundred eighty-nine".