285565440 has 240 divisors, whose sum is σ = 972848448. Its totient is φ = 71442432.

The previous prime is 285565417. The next prime is 285565471. The reversal of 285565440 is 44565582.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 2772429 + ... + 2772531.

Almost surely, 2^285565440 is an apocalyptic number.

285565440 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 285565440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486424224).

285565440 is an abundant number, since it is smaller than the sum of its proper divisors (687283008).

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

285565440 is a wasteful number, since it uses less digits than its factorization.

285565440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 39.

The square root of 285565440 is about 16898.6816053798. The cubic root of 285565440 is about 658.5193621940.

The spelling of 285565440 in words is "two hundred eighty-five million, five hundred sixty-five thousand, four hundred forty".