255540560 has 80 divisors (see below), whose sum is σ = 660493440. Its totient is φ = 91153920.

The previous prime is 255540499. The next prime is 255540569. The reversal of 255540560 is 65045552.

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

It is a super-2 number, since 2×255540560² = 130601955610227200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255540569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43901 + ... + 49379.

It is an arithmetic number, because the mean of its divisors is an integer number (8256168).

Almost surely, 2^255540560 is an apocalyptic number.

255540560 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 255540560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330246720).

255540560 is an abundant number, since it is smaller than the sum of its proper divisors (404952880).

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

255540560 is a wasteful number, since it uses less digits than its factorization.

255540560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556 (or 5550 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 32.

The square root of 255540560 is about 15985.6360524065. The cubic root of 255540560 is about 634.5803414786.

The spelling of 255540560 in words is "two hundred fifty-five million, five hundred forty thousand, five hundred sixty".