256611742 has 16 divisors (see below), whose sum is σ = 395070480. Its totient is φ = 124964928.

The previous prime is 256611721. The next prime is 256611757. The reversal of 256611742 is 247116652.

It is a super-3 number, since 3×256611742³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 256611698 and 256611707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1168 + ... + 22684.

It is an arithmetic number, because the mean of its divisors is an integer number (24691905).

Almost surely, 2^256611742 is an apocalyptic number.

256611742 is a deficient number, since it is larger than the sum of its proper divisors (138458738).

256611742 is a wasteful number, since it uses less digits than its factorization.

256611742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21675.

The product of its digits is 20160, while the sum is 34.

The square root of 256611742 is about 16019.1055305844. The cubic root of 256611742 is about 635.4657892334.

The spelling of 256611742 in words is "two hundred fifty-six million, six hundred eleven thousand, seven hundred forty-two".