28005780828 has 24 divisors (see below), whose sum is σ = 65678537232. Its totient is φ = 9287872384.

The previous prime is 28005780823. The next prime is 28005780839. The reversal of 28005780828 is 82808750082.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28005780823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5921025 + ... + 5925752.

It is an arithmetic number, because the mean of its divisors is an integer number (2736605718).

Almost surely, 2^28005780828 is an apocalyptic number.

It is an amenable number.

28005780828 is an abundant number, since it is smaller than the sum of its proper divisors (37672756404).

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

28005780828 is a wasteful number, since it uses less digits than its factorization.

28005780828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11846981 (or 11846979 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 48.

The spelling of 28005780828 in words is "twenty-eight billion, five million, seven hundred eighty thousand, eight hundred twenty-eight".