255410640 has 60 divisors (see below), whose sum is σ = 857756484. Its totient is φ = 68109312.

The previous prime is 255410621. The next prime is 255410641. The reversal of 255410640 is 46014552.

255410640 is a `hidden beast` number, since 2 + 5 + 5 + 4 + 10 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 133263936 + 122146704 = 11544^2 + 11052^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255410641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 176649 + ... + 178088.

Almost surely, 2^255410640 is an apocalyptic number.

255410640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255410640 is an abundant number, since it is smaller than the sum of its proper divisors (602345844).

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

255410640 is a wasteful number, since it uses less digits than its factorization.

255410640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354756 (or 354747 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 255410640 is about 15981.5718876461. The cubic root of 255410640 is about 634.4727804012.

The spelling of 255410640 in words is "two hundred fifty-five million, four hundred ten thousand, six hundred forty".