285448140 has 72 divisors (see below), whose sum is σ = 878819760. Its totient is φ = 74980224.

The previous prime is 285448133. The next prime is 285448151. The reversal of 285448140 is 41844582.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 285448095 and 285448104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 226 + ... + 23894.

It is an arithmetic number, because the mean of its divisors is an integer number (12205830).

Almost surely, 2^285448140 is an apocalyptic number.

285448140 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 285448140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (439409880).

285448140 is an abundant number, since it is smaller than the sum of its proper divisors (593371620).

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

285448140 is a wasteful number, since it uses less digits than its factorization.

285448140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23751 (or 23746 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

The square root of 285448140 is about 16895.2105639439. The cubic root of 285448140 is about 658.4291844984.

The spelling of 285448140 in words is "two hundred eighty-five million, four hundred forty-eight thousand, one hundred forty".