28045831390987 has 4 divisors (see below), whose sum is σ = 28045901379240. Its totient is φ = 28045761402736.

The previous prime is 28045831390979. The next prime is 28045831391009. The reversal of 28045831390987 is 78909313854082.

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 28045831390987 - 2³ = 28045831390979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28045831390387) 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, 34389562 + ... + 35195647.

It is an arithmetic number, because the mean of its divisors is an integer number (7011475344810).

Almost surely, 2^{28045831390987} is an apocalyptic number.

28045831390987 is a deficient number, since it is larger than the sum of its proper divisors (69988253).

28045831390987 is an equidigital number, since it uses as much as digits as its factorization.

28045831390987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69988252.

The product of its (nonzero) digits is 104509440, while the sum is 67.

The spelling of 28045831390987 in words is "twenty-eight trillion, forty-five billion, eight hundred thirty-one million, three hundred ninety thousand, nine hundred eighty-seven".