255640424 has 32 divisors (see below), whose sum is σ = 546565320. Its totient is φ = 111046656.

The previous prime is 255640417. The next prime is 255640457. The reversal of 255640424 is 424046552.

It can be written as a sum of positive squares in 4 ways, for example, as 156000100 + 99640324 = 12490^2 + 9982^2 .

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, 70529 + ... + 74064.

Almost surely, 2^255640424 is an apocalyptic number.

It is an amenable number.

255640424 is an abundant number, since it is smaller than the sum of its proper divisors (290924896).

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

255640424 is a wasteful number, since it uses less digits than its factorization.

255640424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144629 (or 144625 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The square root of 255640424 is about 15988.7593014593. The cubic root of 255640424 is about 634.6629943432.

Adding to 255640424 its reverse (424046552), we get a palindrome (679686976).

The spelling of 255640424 in words is "two hundred fifty-five million, six hundred forty thousand, four hundred twenty-four".