256641198 has 16 divisors (see below), whose sum is σ = 559944576. Its totient is φ = 77770040.

The previous prime is 256641169. The next prime is 256641223. The reversal of 256641198 is 891146652.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1944186 + ... + 1944317.

It is an arithmetic number, because the mean of its divisors is an integer number (34996536).

Almost surely, 2^256641198 is an apocalyptic number.

256641198 is an abundant number, since it is smaller than the sum of its proper divisors (303303378).

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

256641198 is a wasteful number, since it uses less digits than its factorization.

256641198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888519.

The product of its digits is 103680, while the sum is 42.

The square root of 256641198 is about 16020.0249063477. The cubic root of 256641198 is about 635.4901029612.

It can be divided in two parts, 25664 and 1198, that added together give a palindrome (26862).

The spelling of 256641198 in words is "two hundred fifty-six million, six hundred forty-one thousand, one hundred ninety-eight".