255505440 has 96 divisors (see below), whose sum is σ = 824535936. Its totient is φ = 66467840.

The previous prime is 255505433. The next prime is 255505451. The reversal of 255505440 is 44505552.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 255505398 and 255505407.

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 15 ways as a sum of consecutive naturals, for example, 13189 + ... + 26171.

It is an arithmetic number, because the mean of its divisors is an integer number (8588916).

Almost surely, 2^255505440 is an apocalyptic number.

255505440 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 255505440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (412267968).

255505440 is an abundant number, since it is smaller than the sum of its proper divisors (569030496).

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

255505440 is a wasteful number, since it uses less digits than its factorization.

255505440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13042 (or 13034 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 30.

The square root of 255505440 is about 15984.5375284992. The cubic root of 255505440 is about 634.5512691431.

The spelling of 255505440 in words is "two hundred fifty-five million, five hundred five thousand, four hundred forty".