256990188 has 144 divisors (see below), whose sum is σ = 761139456. Its totient is φ = 66044160.

The previous prime is 256990183. The next prime is 256990211. The reversal of 256990188 is 881099652.

It is a happy number.

256990188 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (256990183) 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 47 ways as a sum of consecutive naturals, for example, 610218 + ... + 610638.

Almost surely, 2^256990188 is an apocalyptic number.

256990188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256990188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (380569728).

256990188 is an abundant number, since it is smaller than the sum of its proper divisors (504149268).

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

256990188 is a wasteful number, since it uses less digits than its factorization.

256990188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 256990188 is about 16030.9135110885. The cubic root of 256990188 is about 635.7780266469.

The spelling of 256990188 in words is "two hundred fifty-six million, nine hundred ninety thousand, one hundred eighty-eight".