255440000 has 160 divisors (see below), whose sum is σ = 662787840. Its totient is φ = 97920000.

The previous prime is 255439967. The next prime is 255440023. The reversal of 255440000 is 44552.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 2479949 + ... + 2480051.

It is an arithmetic number, because the mean of its divisors is an integer number (4142424).

Almost surely, 2^255440000 is an apocalyptic number.

255440000 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 255440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331393920).

255440000 is an abundant number, since it is smaller than the sum of its proper divisors (407347840).

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

255440000 is an equidigital number, since it uses as much as digits as its factorization.

255440000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 255440000 is about 15982.4904192056. The cubic root of 255440000 is about 634.4970908046.

Adding to 255440000 its reverse (44552), we get a palindrome (255484552).

The spelling of 255440000 in words is "two hundred fifty-five million, four hundred forty thousand".