255294640 has 80 divisors (see below), whose sum is σ = 636789600. Its totient is φ = 94887936.

The previous prime is 255294619. The next prime is 255294691. The reversal of 255294640 is 46492552.

255294640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 255294640.

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, 78976 + ... + 82144.

It is an arithmetic number, because the mean of its divisors is an integer number (7959870).

Almost surely, 2^255294640 is an apocalyptic number.

255294640 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 255294640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318394800).

255294640 is an abundant number, since it is smaller than the sum of its proper divisors (381494960).

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

255294640 is a wasteful number, since it uses less digits than its factorization.

255294640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3254 (or 3248 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 255294640 is about 15977.9422955523. The cubic root of 255294640 is about 634.3767128979.

The spelling of 255294640 in words is "two hundred fifty-five million, two hundred ninety-four thousand, six hundred forty".