28122863217781 has 8 divisors (see below), whose sum is σ = 28218815444864. Its totient is φ = 28027049153040.

The previous prime is 28122863217649. The next prime is 28122863217811. The reversal of 28122863217781 is 18771236822182.

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 28122863217781 - 2⁹ = 28122863217269 is a prime.

It is a super-2 number, since 2×28122863217781² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122863217481) 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, 34132785 + ... + 34946998.

It is an arithmetic number, because the mean of its divisors is an integer number (3527351930608).

Almost surely, 2^{28122863217781} is an apocalyptic number.

It is an amenable number.

28122863217781 is a deficient number, since it is larger than the sum of its proper divisors (95952227083).

28122863217781 is an equidigital number, since it uses as much as digits as its factorization.

28122863217781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69081171.

The product of its digits is 7225344, while the sum is 58.

The spelling of 28122863217781 in words is "twenty-eight trillion, one hundred twenty-two billion, eight hundred sixty-three million, two hundred seventeen thousand, seven hundred eighty-one".