28542021920 has 96 divisors (see below), whose sum is σ = 71341300800. Its totient is φ = 10760795136.

The previous prime is 28542021913. The next prime is 28542021929. The reversal of 28542021920 is 2912024582.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28542021929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 575051 + ... + 622709.

It is an arithmetic number, because the mean of its divisors is an integer number (743138550).

Almost surely, 2^28542021920 is an apocalyptic number.

28542021920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28542021920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35670650400).

28542021920 is an abundant number, since it is smaller than the sum of its proper divisors (42799278880).

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

28542021920 is a wasteful number, since it uses less digits than its factorization.

28542021920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47890 (or 47882 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 28542021920 in words is "twenty-eight billion, five hundred forty-two million, twenty-one thousand, nine hundred twenty".