255665440 has 48 divisors (see below), whose sum is σ = 605828160. Its totient is φ = 101958400.

The previous prime is 255665419. The next prime is 255665453. The reversal of 255665440 is 44566552.

It is a self number, because there is not a number n which added to its sum of digits gives 255665440.

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 7 ways as a sum of consecutive naturals, for example, 55215 + ... + 59665.

It is an arithmetic number, because the mean of its divisors is an integer number (12621420).

Almost surely, 2^255665440 is an apocalyptic number.

255665440 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 255665440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (302914080).

255665440 is an abundant number, since it is smaller than the sum of its proper divisors (350162720).

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

255665440 is a wasteful number, since it uses less digits than its factorization.

255665440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825 (or 4817 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 255665440 is about 15989.5415819216. The cubic root of 255665440 is about 634.6836955705.

The spelling of 255665440 in words is "two hundred fifty-five million, six hundred sixty-five thousand, four hundred forty".