255520224 has 96 divisors (see below), whose sum is σ = 765505440. Its totient is φ = 82861056.

The previous prime is 255520219. The next prime is 255520253. The reversal of 255520224 is 422025552.

It is a Cunningham number, because it is equal to 15985²-1.

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 (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27972 + ... + 35964.

It is an arithmetic number, because the mean of its divisors is an integer number (7974015).

Almost surely, 2^255520224 is an apocalyptic number.

255520224 is a gapful number since it is divisible by the number (24) 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 255520224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382752720).

255520224 is an abundant number, since it is smaller than the sum of its proper divisors (509985216).

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

255520224 is a wasteful number, since it uses less digits than its factorization.

255520224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8049 (or 8035 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 27.

The square root of 255520224 is about 15984.9999687207. Note that the first 4 decimals coincide. The cubic root of 255520224 is about 634.5635076628.

Adding to 255520224 its reverse (422025552), we get a palindrome (677545776).

The spelling of 255520224 in words is "two hundred fifty-five million, five hundred twenty thousand, two hundred twenty-four".