285109020 has 144 divisors (see below), whose sum is σ = 1002613248. Its totient is φ = 64229760.

The previous prime is 285109007. The next prime is 285109021. The reversal of 285109020 is 20901582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285109021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87867 + ... + 91053.

It is an arithmetic number, because the mean of its divisors is an integer number (6962592).

Almost surely, 2^285109020 is an apocalyptic number.

285109020 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 285109020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (501306624).

285109020 is an abundant number, since it is smaller than the sum of its proper divisors (717504228).

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

285109020 is a wasteful number, since it uses less digits than its factorization.

285109020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3280 (or 3275 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 285109020 is about 16885.1716011416. The cubic root of 285109020 is about 658.1683373653.

The spelling of 285109020 in words is "two hundred eighty-five million, one hundred nine thousand, twenty".