28916291390289 has 4 divisors (see below), whose sum is σ = 38555055187056. Its totient is φ = 19277527593524.

The previous prime is 28916291390269. The next prime is 28916291390341. The reversal of 28916291390289 is 98209319261982.

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 a de Polignac number, because none of the positive numbers 2^k-28916291390289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28916291390209) 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, 4819381898379 + ... + 4819381898384.

It is an arithmetic number, because the mean of its divisors is an integer number (9638763796764).

Almost surely, 2^{28916291390289} is an apocalyptic number.

It is an amenable number.

28916291390289 is a deficient number, since it is larger than the sum of its proper divisors (9638763796767).

28916291390289 is an equidigital number, since it uses as much as digits as its factorization.

28916291390289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9638763796766.

The product of its (nonzero) digits is 60466176, while the sum is 69.

The spelling of 28916291390289 in words is "twenty-eight trillion, nine hundred sixteen billion, two hundred ninety-one million, three hundred ninety thousand, two hundred eighty-nine".