256336728 has 16 divisors (see below), whose sum is σ = 640841880. Its totient is φ = 85445568.

The previous prime is 256336723. The next prime is 256336741. The reversal of 256336728 is 827633652.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 256336728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256336723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5340325 + ... + 5340372.

Almost surely, 2^256336728 is an apocalyptic number.

It is an amenable number.

256336728 is an abundant number, since it is smaller than the sum of its proper divisors (384505152).

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

256336728 is a wasteful number, since it uses less digits than its factorization.

256336728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10680706 (or 10680702 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 256336728 is about 16010.5192920155. The cubic root of 256336728 is about 635.2386958874.

The spelling of 256336728 in words is "two hundred fifty-six million, three hundred thirty-six thousand, seven hundred twenty-eight".