256171830 has 16 divisors (see below), whose sum is σ = 614812464. Its totient is φ = 68312480.

The previous prime is 256171829. The next prime is 256171837. The reversal of 256171830 is 38171652.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 256171791 and 256171800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256171837) 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 7 ways as a sum of consecutive naturals, for example, 4269501 + ... + 4269560.

It is an arithmetic number, because the mean of its divisors is an integer number (38425779).

Almost surely, 2^256171830 is an apocalyptic number.

256171830 is an abundant number, since it is smaller than the sum of its proper divisors (358640634).

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

256171830 is a wasteful number, since it uses less digits than its factorization.

256171830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8539071.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 256171830 is about 16005.3687867540. The cubic root of 256171830 is about 635.1024531406.

The spelling of 256171830 in words is "two hundred fifty-six million, one hundred seventy-one thousand, eight hundred thirty".