28420145800 has 96 divisors (see below), whose sum is σ = 66558240000. Its totient is φ = 11285556480.

The previous prime is 28420145759. The next prime is 28420145837. The reversal of 28420145800 is 854102482.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22254762 + ... + 22256038.

It is an arithmetic number, because the mean of its divisors is an integer number (693315000).

Almost surely, 2^28420145800 is an apocalyptic number.

28420145800 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 28420145800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33279120000).

28420145800 is an abundant number, since it is smaller than the sum of its proper divisors (38138094200).

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

28420145800 is a wasteful number, since it uses less digits than its factorization.

28420145800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The spelling of 28420145800 in words is "twenty-eight billion, four hundred twenty million, one hundred forty-five thousand, eight hundred".