255584640 has 64 divisors (see below), whose sum is σ = 814682160. Its totient is φ = 68155392.

The previous prime is 255584633. The next prime is 255584683. The reversal of 255584640 is 46485552.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64639 + ... + 68478.

Almost surely, 2^255584640 is an apocalyptic number.

255584640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255584640 is an abundant number, since it is smaller than the sum of its proper divisors (559097520).

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

255584640 is a wasteful number, since it uses less digits than its factorization.

255584640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133139 (or 133127 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 39.

The square root of 255584640 is about 15987.0147307119. The cubic root of 255584640 is about 634.6168271324.

The spelling of 255584640 in words is "two hundred fifty-five million, five hundred eighty-four thousand, six hundred forty".