256115784 has 32 divisors (see below), whose sum is σ = 653915520. Its totient is φ = 83555136.

The previous prime is 256115773. The next prime is 256115789. The reversal of 256115784 is 487511652.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (256115789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112399 + ... + 114654.

It is an arithmetic number, because the mean of its divisors is an integer number (20434860).

Almost surely, 2^256115784 is an apocalyptic number.

256115784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256115784 is an abundant number, since it is smaller than the sum of its proper divisors (397799736).

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

256115784 is a wasteful number, since it uses less digits than its factorization.

256115784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227109 (or 227105 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The square root of 256115784 is about 16003.6178409758. The cubic root of 256115784 is about 635.0561332567.

The spelling of 256115784 in words is "two hundred fifty-six million, one hundred fifteen thousand, seven hundred eighty-four".