255780015 has 16 divisors (see below), whose sum is σ = 415958496. Its totient is φ = 134179200.

The previous prime is 255780013. The next prime is 255780023. The reversal of 255780015 is 510087552.

It is a happy number.

It is not a de Polignac number, because 255780015 - 2¹ = 255780013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255780013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138856 + ... + 140685.

It is an arithmetic number, because the mean of its divisors is an integer number (25997406).

Almost surely, 2^255780015 is an apocalyptic number.

255780015 is a deficient number, since it is larger than the sum of its proper divisors (160178481).

255780015 is a wasteful number, since it uses less digits than its factorization.

255780015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279610.

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 255780015 is about 15993.1239912657. The cubic root of 255780015 is about 634.7784913634.

The spelling of 255780015 in words is "two hundred fifty-five million, seven hundred eighty thousand, fifteen".