28191337795565 has 8 divisors (see below), whose sum is σ = 38662406119680. Its totient is φ = 19331203059792.

The previous prime is 28191337795553. The next prime is 28191337795591. The reversal of 28191337795565 is 56559773319182.

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 28191337795565 - 2¹⁰ = 28191337794541 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 402733397045 + ... + 402733397114.

It is an arithmetic number, because the mean of its divisors is an integer number (4832800764960).

Almost surely, 2^{28191337795565} is an apocalyptic number.

It is an amenable number.

28191337795565 is a deficient number, since it is larger than the sum of its proper divisors (10471068324115).

28191337795565 is an equidigital number, since it uses as much as digits as its factorization.

28191337795565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805466794171.

The product of its digits is 428652000, while the sum is 71.

The spelling of 28191337795565 in words is "twenty-eight trillion, one hundred ninety-one billion, three hundred thirty-seven million, seven hundred ninety-five thousand, five hundred sixty-five".