255403440 has 60 divisors (see below), whose sum is σ = 857732304. Its totient is φ = 68107392.

The previous prime is 255403411. The next prime is 255403441. The reversal of 255403440 is 44304552.

255403440 is a `hidden beast` number, since 255 + 403 + 4 + 4 + 0 = 666.

255403440 is digitally balanced in base 2, 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 (60).

It is not an unprimeable number, because it can be changed into a prime (255403441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176644 + ... + 178083.

Almost surely, 2^255403440 is an apocalyptic number.

255403440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255403440 is an abundant number, since it is smaller than the sum of its proper divisors (602328864).

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

255403440 is a wasteful number, since it uses less digits than its factorization.

255403440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354746 (or 354737 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 255403440 is about 15981.3466266144. The cubic root of 255403440 is about 634.4668184374.

Adding to 255403440 its reverse (44304552), we get a palindrome (299707992).

The spelling of 255403440 in words is "two hundred fifty-five million, four hundred three thousand, four hundred forty".