28126431665 has 8 divisors (see below), whose sum is σ = 33794609280. Its totient is φ = 22472551152.

The previous prime is 28126431649. The next prime is 28126431701. The reversal of 28126431665 is 56613462182.

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 28126431665 - 2⁴ = 28126431649 is a prime.

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, 3569945 + ... + 3577814.

It is an arithmetic number, because the mean of its divisors is an integer number (4224326160).

Almost surely, 2^28126431665 is an apocalyptic number.

It is an amenable number.

28126431665 is a deficient number, since it is larger than the sum of its proper divisors (5668177615).

28126431665 is an equidigital number, since it uses as much as digits as its factorization.

28126431665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7148551.

The product of its digits is 414720, while the sum is 44.

The spelling of 28126431665 in words is "twenty-eight billion, one hundred twenty-six million, four hundred thirty-one thousand, six hundred sixty-five".