256187530 has 32 divisors (see below), whose sum is σ = 467026560. Its totient is φ = 101175360.

The previous prime is 256187527. The next prime is 256187563. The reversal of 256187530 is 35781652.

It is a self number, because there is not a number n which added to its sum of digits gives 256187530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352027 + ... + 352753.

It is an arithmetic number, because the mean of its divisors is an integer number (14594580).

Almost surely, 2^256187530 is an apocalyptic number.

256187530 is a deficient number, since it is larger than the sum of its proper divisors (210839030).

256187530 is a wasteful number, since it uses less digits than its factorization.

256187530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 256187530 is about 16005.8592396660. The cubic root of 256187530 is about 635.1154273811.

The spelling of 256187530 in words is "two hundred fifty-six million, one hundred eighty-seven thousand, five hundred thirty".