28128591995 has 8 divisors (see below), whose sum is σ = 38576354784. Its totient is φ = 19288177344.

The previous prime is 28128591991. The next prime is 28128592013. The reversal of 28128591995 is 59919582182.

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 28128591995 - 2² = 28128591991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28128591991) 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, 401836994 + ... + 401837063.

It is an arithmetic number, because the mean of its divisors is an integer number (4822044348).

Almost surely, 2^28128591995 is an apocalyptic number.

28128591995 is a deficient number, since it is larger than the sum of its proper divisors (10447762789).

28128591995 is an equidigital number, since it uses as much as digits as its factorization.

28128591995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803674069.

The product of its digits is 4665600, while the sum is 59.

The spelling of 28128591995 in words is "twenty-eight billion, one hundred twenty-eight million, five hundred ninety-one thousand, nine hundred ninety-five".