255530778 has 32 divisors (see below), whose sum is σ = 525595392. Its totient is φ = 82771200.

The previous prime is 255530777. The next prime is 255530783. The reversal of 255530778 is 877035552.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (255530777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64750 + ... + 68582.

It is an arithmetic number, because the mean of its divisors is an integer number (16424856).

Almost surely, 2^255530778 is an apocalyptic number.

255530778 is an abundant number, since it is smaller than the sum of its proper divisors (270064614).

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

255530778 is a wasteful number, since it uses less digits than its factorization.

255530778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4150.

The product of its (nonzero) digits is 294000, while the sum is 42.

The square root of 255530778 is about 15985.3300873019. The cubic root of 255530778 is about 634.5722442068.

It can be divided in two parts, 2555 and 30778, that added together give a palindrome (33333).

The spelling of 255530778 in words is "two hundred fifty-five million, five hundred thirty thousand, seven hundred seventy-eight".