28889907506809 has 8 divisors (see below), whose sum is σ = 28977990125472. Its totient is φ = 28801860151680.

The previous prime is 28889907506791. The next prime is 28889907506819. The reversal of 28889907506809 is 90860570998882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28889907506809 - 2²⁷ = 28889773289081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28889907506819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7174407 + ... + 10452364.

It is an arithmetic number, because the mean of its divisors is an integer number (3622248765684).

Almost surely, 2^{28889907506809} is an apocalyptic number.

It is an amenable number.

28889907506809 is a deficient number, since it is larger than the sum of its proper divisors (88082618663).

28889907506809 is a wasteful number, since it uses less digits than its factorization.

28889907506809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17631767.

The product of its (nonzero) digits is 1254113280, while the sum is 79.

The spelling of 28889907506809 in words is "twenty-eight trillion, eight hundred eighty-nine billion, nine hundred seven million, five hundred six thousand, eight hundred nine".