256559030 has 32 divisors (see below), whose sum is σ = 568378944. Its totient is φ = 81196416.

The previous prime is 256559021. The next prime is 256559101. The reversal of 256559030 is 30955652.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 140057 + ... + 141876.

It is an arithmetic number, because the mean of its divisors is an integer number (17761842).

Almost surely, 2^256559030 is an apocalyptic number.

256559030 is an abundant number, since it is smaller than the sum of its proper divisors (311819914).

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

256559030 is a wasteful number, since it uses less digits than its factorization.

256559030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281960.

The product of its (nonzero) digits is 40500, while the sum is 35.

The square root of 256559030 is about 16017.4601607121. The cubic root of 256559030 is about 635.4222747703.

The spelling of 256559030 in words is "two hundred fifty-six million, five hundred fifty-nine thousand, thirty".