28085577437 has 4 divisors (see below), whose sum is σ = 28086358560. Its totient is φ = 28084796316.

The previous prime is 28085577431. The next prime is 28085577467. The reversal of 28085577437 is 73477558082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28085577437 - 2²² = 28081383133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28085577431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333887 + ... + 409452.

It is an arithmetic number, because the mean of its divisors is an integer number (7021589640).

Almost surely, 2^28085577437 is an apocalyptic number.

It is an amenable number.

28085577437 is a deficient number, since it is larger than the sum of its proper divisors (781123).

28085577437 is an equidigital number, since it uses as much as digits as its factorization.

28085577437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781122.

The product of its (nonzero) digits is 13171200, while the sum is 56.

The spelling of 28085577437 in words is "twenty-eight billion, eighty-five million, five hundred seventy-seven thousand, four hundred thirty-seven".