255777820 has 12 divisors (see below), whose sum is σ = 537133464. Its totient is φ = 102311120.

The previous prime is 255777817. The next prime is 255777827. The reversal of 255777820 is 28777552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255777827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6394426 + ... + 6394465.

It is an arithmetic number, because the mean of its divisors is an integer number (44761122).

Almost surely, 2^255777820 is an apocalyptic number.

255777820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255777820 is an abundant number, since it is smaller than the sum of its proper divisors (281355644).

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

255777820 is a wasteful number, since it uses less digits than its factorization.

255777820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12788900 (or 12788898 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 43.

The square root of 255777820 is about 15993.0553678776. The cubic root of 255777820 is about 634.7766755546.

The spelling of 255777820 in words is "two hundred fifty-five million, seven hundred seventy-seven thousand, eight hundred twenty".