256689734 has 48 divisors (see below), whose sum is σ = 486789120. Its totient is φ = 100835280.

The previous prime is 256689731. The next prime is 256689743. The reversal of 256689734 is 437986652.

It is a happy number.

256689734 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256689731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55499 + ... + 59945.

It is an arithmetic number, because the mean of its divisors is an integer number (10141440).

Almost surely, 2^256689734 is an apocalyptic number.

256689734 is a deficient number, since it is larger than the sum of its proper divisors (230099386).

256689734 is a wasteful number, since it uses less digits than its factorization.

256689734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513 (or 4506 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The square root of 256689734 is about 16021.5396888064. The cubic root of 256689734 is about 635.5301617458.

The spelling of 256689734 in words is "two hundred fifty-six million, six hundred eighty-nine thousand, seven hundred thirty-four".