255685540 has 96 divisors (see below), whose sum is σ = 609493248. Its totient is φ = 89280000.

The previous prime is 255685537. The next prime is 255685541. The reversal of 255685540 is 45586552.

It is a junction number, because it is equal to n+sod(n) for n = 255685493 and 255685502.

It is not an unprimeable number, because it can be changed into a prime (255685541) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 821985 + ... + 822295.

It is an arithmetic number, because the mean of its divisors is an integer number (6348888).

Almost surely, 2^255685540 is an apocalyptic number.

255685540 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 255685540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304746624).

255685540 is an abundant number, since it is smaller than the sum of its proper divisors (353807708).

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

255685540 is a wasteful number, since it uses less digits than its factorization.

255685540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 40.

The square root of 255685540 is about 15990.1701054116. The cubic root of 255685540 is about 634.7003277337.

The spelling of 255685540 in words is "two hundred fifty-five million, six hundred eighty-five thousand, five hundred forty".