256220375 has 16 divisors (see below), whose sum is σ = 328411200. Its totient is φ = 199432800.

The previous prime is 256220369. The next prime is 256220387. The reversal of 256220375 is 573022652.

It is a de Polignac number, because none of the positive numbers 2^k-256220375 is a prime.

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, 23075 + ... + 32324.

It is an arithmetic number, because the mean of its divisors is an integer number (20525700).

Almost surely, 2^256220375 is an apocalyptic number.

256220375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256220375 is a deficient number, since it is larger than the sum of its proper divisors (72190825).

256220375 is an equidigital number, since it uses as much as digits as its factorization.

256220375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55451 (or 55441 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 256220375 is about 16006.8852372971. The cubic root of 256220375 is about 635.1425682738.

The spelling of 256220375 in words is "two hundred fifty-six million, two hundred twenty thousand, three hundred seventy-five".