28781293860 has 288 divisors, whose sum is σ = 101959603200. Its totient is φ = 6497521920.

The previous prime is 28781293831. The next prime is 28781293867. The reversal of 28781293860 is 6839218782.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28781293797 and 28781293806.

It is not an unprimeable number, because it can be changed into a prime (28781293867) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2213097 + ... + 2226063.

It is an arithmetic number, because the mean of its divisors is an integer number (354026400).

Almost surely, 2^28781293860 is an apocalyptic number.

28781293860 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 28781293860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50979801600).

28781293860 is an abundant number, since it is smaller than the sum of its proper divisors (73178309340).

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

28781293860 is a wasteful number, since it uses less digits than its factorization.

28781293860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13071 (or 13066 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 28781293860 in words is "twenty-eight billion, seven hundred eighty-one million, two hundred ninety-three thousand, eight hundred sixty".