256000642 has 8 divisors (see below), whose sum is σ = 404211600. Its totient is φ = 121263444.

The previous prime is 256000627. The next prime is 256000711. The reversal of 256000642 is 246000652.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3368392 + ... + 3368467.

It is an arithmetic number, because the mean of its divisors is an integer number (50526450).

Almost surely, 2^256000642 is an apocalyptic number.

256000642 is a deficient number, since it is larger than the sum of its proper divisors (148210958).

256000642 is a wasteful number, since it uses less digits than its factorization.

256000642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6736880.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 256000642 is about 16000.0200624874. The cubic root of 256000642 is about 634.9609515741.

The spelling of 256000642 in words is "two hundred fifty-six million, six hundred forty-two", and thus it is an aban number.