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285444 = 2234881
BaseRepresentation
bin1000101101100000100
3112111120000
41011230010
533113234
610041300
72266125
oct1055404
9474500
10285444
11185505
12119230
139cc03
147604c
1559899
hex45b04

285444 has 30 divisors (see below), whose sum is σ = 747054. Its totient is φ = 95040.

The previous prime is 285433. The next prime is 285451. The reversal of 285444 is 444582.

It can be written as a sum of positive squares in only one way, i.e., 202500 + 82944 = 450^2 + 288^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 117 + ... + 764.

2285444 is an apocalyptic number.

It is an amenable number.

285444 is an abundant number, since it is smaller than the sum of its proper divisors (461610).

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

285444 is a wasteful number, since it uses less digits than its factorization.

285444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 886 counting only the distinct ones).

The product of its digits is 5120, while the sum is 27.

The square root of 285444 is about 534.2695948676. The cubic root of 285444 is about 65.8426001305.

It can be divided in two parts, 285 and 444, that added together give a 6-th power (729 = 36).

The spelling of 285444 in words is "two hundred eighty-five thousand, four hundred forty-four".