28128704340 has 48 divisors (see below), whose sum is σ = 85920408000. Its totient is φ = 6819079680.

The previous prime is 28128704291. The next prime is 28128704353. The reversal of 28128704340 is 4340782182.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21308965 + ... + 21310284.

It is an arithmetic number, because the mean of its divisors is an integer number (1790008500).

Almost surely, 2^28128704340 is an apocalyptic number.

28128704340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28128704340 is an abundant number, since it is smaller than the sum of its proper divisors (57791703660).

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

28128704340 is a wasteful number, since it uses less digits than its factorization.

28128704340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42619272 (or 42619270 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The spelling of 28128704340 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred four thousand, three hundred forty".