255091840 has 32 divisors (see below), whose sum is σ = 609830460. Its totient is φ = 102036480.

The previous prime is 255091831. The next prime is 255091849. The reversal of 255091840 is 48190552.

255091840 is nontrivially palindromic in base 3.

It is an interprime number because it is at equal distance from previous prime (255091831) and next prime (255091849).

It can be written as a sum of positive squares in 2 ways, for example, as 238640704 + 16451136 = 15448^2 + 4056^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 255091796 and 255091805.

It is not an unprimeable number, because it can be changed into a prime (255091849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198651 + ... + 199930.

Almost surely, 2^255091840 is an apocalyptic number.

255091840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255091840 is an abundant number, since it is smaller than the sum of its proper divisors (354738620).

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

255091840 is an equidigital number, since it uses as much as digits as its factorization.

255091840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398600 (or 398588 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 255091840 is about 15971.5947857438. The cubic root of 255091840 is about 634.2086904666.

The spelling of 255091840 in words is "two hundred fifty-five million, ninety-one thousand, eight hundred forty".