28091898427 has 4 divisors (see below), whose sum is σ = 28093413600. Its totient is φ = 28090383256.

The previous prime is 28091898371. The next prime is 28091898431. The reversal of 28091898427 is 72489819082.

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 28091898427 - 2⁷ = 28091898299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28091898467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 729427 + ... + 766972.

It is an arithmetic number, because the mean of its divisors is an integer number (7023353400).

Almost surely, 2^28091898427 is an apocalyptic number.

28091898427 is a deficient number, since it is larger than the sum of its proper divisors (1515173).

28091898427 is a wasteful number, since it uses less digits than its factorization.

28091898427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515172.

The product of its (nonzero) digits is 4644864, while the sum is 58.

The spelling of 28091898427 in words is "twenty-eight billion, ninety-one million, eight hundred ninety-eight thousand, four hundred twenty-seven".