28155809995 has 4 divisors (see below), whose sum is σ = 33786972000. Its totient is φ = 22524647992.

The previous prime is 28155809987. The next prime is 28155809999. The reversal of 28155809995 is 59990855182.

28155809995 is digitally balanced in base 11, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28155809995 - 2³ = 28155809987 is a prime.

28155809995 is strictly pandigital in base 11.

It is not an unprimeable number, because it can be changed into a prime (28155809999) 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, 2815580995 + ... + 2815581004.

It is an arithmetic number, because the mean of its divisors is an integer number (8446743000).

Almost surely, 2^28155809995 is an apocalyptic number.

28155809995 is a deficient number, since it is larger than the sum of its proper divisors (5631162005).

28155809995 is an equidigital number, since it uses as much as digits as its factorization.

28155809995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5631162004.

The product of its (nonzero) digits is 11664000, while the sum is 61.

The spelling of 28155809995 in words is "twenty-eight billion, one hundred fifty-five million, eight hundred nine thousand, nine hundred ninety-five".