28078575187 has 4 divisors (see below), whose sum is σ = 30238465600. Its totient is φ = 25918684776.

The previous prime is 28078575167. The next prime is 28078575233. The reversal of 28078575187 is 78157587082.

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 28078575187 - 2¹⁵ = 28078542419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078575167) 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, 1079945187 + ... + 1079945212.

It is an arithmetic number, because the mean of its divisors is an integer number (7559616400).

Almost surely, 2^28078575187 is an apocalyptic number.

28078575187 is a deficient number, since it is larger than the sum of its proper divisors (2159890413).

28078575187 is a wasteful number, since it uses less digits than its factorization.

28078575187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2159890412.

The product of its (nonzero) digits is 8780800, while the sum is 58.

The spelling of 28078575187 in words is "twenty-eight billion, seventy-eight million, five hundred seventy-five thousand, one hundred eighty-seven".