255640056 has 96 divisors (see below), whose sum is σ = 748172880. Its totient is φ = 72576000.

The previous prime is 255640039. The next prime is 255640069. The reversal of 255640056 is 650046552.

It is a happy number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 255639999 and 255640026.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212256 + ... + 213456.

Almost surely, 2^255640056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255640056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374086440).

255640056 is an abundant number, since it is smaller than the sum of its proper divisors (492532824).

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

255640056 is a wasteful number, since it uses less digits than its factorization.

255640056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405 (or 1394 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 255640056 is about 15988.7477933702. The cubic root of 255640056 is about 634.6626898059.

The spelling of 255640056 in words is "two hundred fifty-five million, six hundred forty thousand, fifty-six".