28056969718009 has 4 divisors (see below), whose sum is σ = 28057001618304. Its totient is φ = 28056937817716.

The previous prime is 28056969717983. The next prime is 28056969718031. The reversal of 28056969718009 is 90081796965082.

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 28056969718009 - 2²⁵ = 28056936163577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056969718039) 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, 14592337 + ... + 16402750.

It is an arithmetic number, because the mean of its divisors is an integer number (7014250404576).

Almost surely, 2^{28056969718009} is an apocalyptic number.

It is an amenable number.

28056969718009 is a deficient number, since it is larger than the sum of its proper divisors (31900295).

28056969718009 is an equidigital number, since it uses as much as digits as its factorization.

28056969718009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31900294.

The product of its (nonzero) digits is 117573120, while the sum is 70.

The spelling of 28056969718009 in words is "twenty-eight trillion, fifty-six billion, nine hundred sixty-nine million, seven hundred eighteen thousand, nine".