28187681890195 has 16 divisors (see below), whose sum is σ = 33843866430528. Its totient is φ = 22537716858880.

The previous prime is 28187681890187. The next prime is 28187681890243. The reversal of 28187681890195 is 59109818678182.

It is not a de Polignac number, because 28187681890195 - 2³ = 28187681890187 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66177747 + ... + 66602323.

It is an arithmetic number, because the mean of its divisors is an integer number (2115241651908).

Almost surely, 2^{28187681890195} is an apocalyptic number.

28187681890195 is a deficient number, since it is larger than the sum of its proper divisors (5656184540333).

28187681890195 is a wasteful number, since it uses less digits than its factorization.

28187681890195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431870.

The product of its (nonzero) digits is 139345920, while the sum is 73.

The spelling of 28187681890195 in words is "twenty-eight trillion, one hundred eighty-seven billion, six hundred eighty-one million, eight hundred ninety thousand, one hundred ninety-five".