256782189 has 16 divisors (see below), whose sum is σ = 360087552. Its totient is φ = 162450288.

The previous prime is 256782181. The next prime is 256782199. The reversal of 256782189 is 981287652.

It is not a de Polignac number, because 256782189 - 2³ = 256782181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256782181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5889 + ... + 23414.

It is an arithmetic number, because the mean of its divisors is an integer number (22505472).

Almost surely, 2^256782189 is an apocalyptic number.

It is an amenable number.

256782189 is a deficient number, since it is larger than the sum of its proper divisors (103305363).

256782189 is a wasteful number, since it uses less digits than its factorization.

256782189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29456.

The product of its digits is 483840, while the sum is 48.

The square root of 256782189 is about 16024.4247634666. The cubic root of 256782189 is about 635.6064547437.

The spelling of 256782189 in words is "two hundred fifty-six million, seven hundred eighty-two thousand, one hundred eighty-nine".