28395685860 has 96 divisors (see below), whose sum is σ = 80274136320. Its totient is φ = 7499470848.

The previous prime is 28395685793. The next prime is 28395685861. The reversal of 28395685860 is 6858659382.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a junction number, because it is equal to n+sod(n) for n = 28395685794 and 28395685803.

It is not an unprimeable number, because it can be changed into a prime (28395685861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3752761 + ... + 3760319.

It is an arithmetic number, because the mean of its divisors is an integer number (836188920).

Almost surely, 2^28395685860 is an apocalyptic number.

28395685860 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 28395685860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40137068160).

28395685860 is an abundant number, since it is smaller than the sum of its proper divisors (51878450460).

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

28395685860 is a wasteful number, since it uses less digits than its factorization.

28395685860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8165 (or 8163 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 60.

The spelling of 28395685860 in words is "twenty-eight billion, three hundred ninety-five million, six hundred eighty-five thousand, eight hundred sixty".