28215096207689 has 4 divisors (see below), whose sum is σ = 28215107325060. Its totient is φ = 28215085090320.

The previous prime is 28215096207631. The next prime is 28215096207709. The reversal of 28215096207689 is 98670269051282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1522528952464 + 26692567255225 = 1233908^2 + 5166485^2 .

It is a cyclic number.

It is not a de Polignac number, because 28215096207689 - 2¹⁶ = 28215096142153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28215096207989) 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, 321959 + ... + 7518899.

It is an arithmetic number, because the mean of its divisors is an integer number (7053776831265).

Almost surely, 2^{28215096207689} is an apocalyptic number.

It is an amenable number.

28215096207689 is a deficient number, since it is larger than the sum of its proper divisors (11117371).

28215096207689 is an equidigital number, since it uses as much as digits as its factorization.

28215096207689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11117370.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 28215096207689 in words is "twenty-eight trillion, two hundred fifteen billion, ninety-six million, two hundred seven thousand, six hundred eighty-nine".