285100 has 18 divisors (see below), whose sum is σ = 618884. Its totient is φ = 114000.

The previous prime is 285091. The next prime is 285101. The reversal of 285100 is 1582.

It is a happy number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (285101) by changing a digit.

285100 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1326 + ... + 1525.

2²⁸⁵¹⁰⁰ is an apocalyptic number.

285100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285100 is an abundant number, since it is smaller than the sum of its proper divisors (333784).

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

285100 is a wasteful number, since it uses less digits than its factorization.

285100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865 (or 2858 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 285100 is about 533.9475629685. The cubic root of 285100 is about 65.8161396464.

Adding to 285100 its reverse (1582), we get a palindrome (286682).

The spelling of 285100 in words is "two hundred eighty-five thousand, one hundred".