256168784 has 40 divisors (see below), whose sum is σ = 527109120. Its totient is φ = 120186368.

The previous prime is 256168763. The next prime is 256168823. The reversal of 256168784 is 487861652.

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, 102947 + ... + 105405.

It is an arithmetic number, because the mean of its divisors is an integer number (13177728).

Almost surely, 2^256168784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256168784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (263554560).

256168784 is an abundant number, since it is smaller than the sum of its proper divisors (270940336).

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

256168784 is a wasteful number, since it uses less digits than its factorization.

256168784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2867 (or 2861 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 256168784 is about 16005.2736309005. The cubic root of 256168784 is about 635.0999359112.

The spelling of 256168784 in words is "two hundred fifty-six million, one hundred sixty-eight thousand, seven hundred eighty-four".