255255440 has 80 divisors (see below), whose sum is σ = 649886976. Its totient is φ = 92467200.

The previous prime is 255255433. The next prime is 255255479. The reversal of 255255440 is 44552552.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 255255397 and 255255406.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 378944 + ... + 379616.

Almost surely, 2^255255440 is an apocalyptic number.

255255440 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 255255440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (324943488).

255255440 is an abundant number, since it is smaller than the sum of its proper divisors (394631536).

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

255255440 is a wasteful number, since it uses less digits than its factorization.

255255440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128 (or 1122 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 32.

The square root of 255255440 is about 15976.7155573353. The cubic root of 255255440 is about 634.3442421286.

The spelling of 255255440 in words is "two hundred fifty-five million, two hundred fifty-five thousand, four hundred forty".