28109086338 has 16 divisors (see below), whose sum is σ = 56219880960. Its totient is φ = 9369410736.

The previous prime is 28109086309. The next prime is 28109086361. The reversal of 28109086338 is 83368090182.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264528 + ... + 355236.

It is an arithmetic number, because the mean of its divisors is an integer number (3513742560).

Almost surely, 2^28109086338 is an apocalyptic number.

28109086338 is an abundant number, since it is smaller than the sum of its proper divisors (28110794622).

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

28109086338 is a wasteful number, since it uses less digits than its factorization.

28109086338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142361.

The product of its (nonzero) digits is 497664, while the sum is 48.

The spelling of 28109086338 in words is "twenty-eight billion, one hundred nine million, eighty-six thousand, three hundred thirty-eight".