256012642 has 8 divisors (see below), whose sum is σ = 384115932. Its totient is φ = 127974000.

The previous prime is 256012633. The next prime is 256012649. The reversal of 256012642 is 246210652.

It can be written as a sum of positive squares in 2 ways, for example, as 253159921 + 2852721 = 15911^2 + 1689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 256012642.

It is not an unprimeable number, because it can be changed into a prime (256012649) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4609 + ... + 23092.

Almost surely, 2^256012642 is an apocalyptic number.

256012642 is a deficient number, since it is larger than the sum of its proper divisors (128103290).

256012642 is a wasteful number, since it uses less digits than its factorization.

256012642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32324.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 256012642 is about 16000.3950576228. The cubic root of 256012642 is about 634.9708726590.

The spelling of 256012642 in words is "two hundred fifty-six million, twelve thousand, six hundred forty-two".