256128006 has 16 divisors (see below), whose sum is σ = 513331200. Its totient is φ = 85196808.

The previous prime is 256127917. The next prime is 256128017. The reversal of 256128006 is 600821652.

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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41686 + ... + 47433.

It is an arithmetic number, because the mean of its divisors is an integer number (32083200).

Almost surely, 2^256128006 is an apocalyptic number.

256128006 is an abundant number, since it is smaller than the sum of its proper divisors (257203194).

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

256128006 is a wasteful number, since it uses less digits than its factorization.

256128006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89603.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 256128006 is about 16003.9996875781. Note that the first 3 decimals coincide. The cubic root of 256128006 is about 635.0662348502.

Adding to 256128006 its reverse (600821652), we get a palindrome (856949658).

The spelling of 256128006 in words is "two hundred fifty-six million, one hundred twenty-eight thousand, six".