256725807 has 16 divisors (see below), whose sum is σ = 371330400. Its totient is φ = 156828672.

The previous prime is 256725803. The next prime is 256725817. The reversal of 256725807 is 708527652.

It is not a de Polignac number, because 256725807 - 2² = 256725803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256725803) by changing a digit.

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, 18682 + ... + 29367.

It is an arithmetic number, because the mean of its divisors is an integer number (23208150).

Almost surely, 2^256725807 is an apocalyptic number.

256725807 is a deficient number, since it is larger than the sum of its proper divisors (114604593).

256725807 is a wasteful number, since it uses less digits than its factorization.

256725807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48202.

The product of its (nonzero) digits is 235200, while the sum is 42.

The square root of 256725807 is about 16022.6654149676. The cubic root of 256725807 is about 635.5599310258.

The spelling of 256725807 in words is "two hundred fifty-six million, seven hundred twenty-five thousand, eight hundred seven".