28509090678 has 48 divisors (see below), whose sum is σ = 65443613040. Its totient is φ = 8938503168.

The previous prime is 28509090667. The next prime is 28509090679. The reversal of 28509090678 is 87609090582.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28509090679) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 482158 + ... + 538046.

It is an arithmetic number, because the mean of its divisors is an integer number (1363408605).

Almost surely, 2^28509090678 is an apocalyptic number.

28509090678 is an abundant number, since it is smaller than the sum of its proper divisors (36934522362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28509090678 is a wasteful number, since it uses less digits than its factorization.

28509090678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57581 (or 57578 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 28509090678 in words is "twenty-eight billion, five hundred nine million, ninety thousand, six hundred seventy-eight".