285717020928 has 144 divisors (see below), whose sum is σ = 805896677376. Its totient is φ = 89554124800.

The previous prime is 285717020921. The next prime is 285717020959. The reversal of 285717020928 is 829020717582.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (285717020921) 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, 15017950 + ... + 15036962.

It is an arithmetic number, because the mean of its divisors is an integer number (5596504704).

Almost surely, 2^285717020928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285717020928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402948338688).

285717020928 is an abundant number, since it is smaller than the sum of its proper divisors (520179656448).

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

285717020928 is a wasteful number, since it uses less digits than its factorization.

285717020928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20200 (or 20186 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 51.

The spelling of 285717020928 in words is "two hundred eighty-five billion, seven hundred seventeen million, twenty thousand, nine hundred twenty-eight".