42768647 has 4 divisors (see below), whose sum is σ = 43105536. Its totient is φ = 42431760.

The previous prime is 42768631. The next prime is 42768653. The reversal of 42768647 is 74686724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42768647 - 2⁴ = 42768631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42768598 and 42768607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42768667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168254 + ... + 168507.

It is an arithmetic number, because the mean of its divisors is an integer number (10776384).

Almost surely, 2^42768647 is an apocalyptic number.

42768647 is a deficient number, since it is larger than the sum of its proper divisors (336889).

42768647 is a wasteful number, since it uses less digits than its factorization.

42768647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336888.

The product of its digits is 451584, while the sum is 44.

The square root of 42768647 is about 6539.7742315771. The cubic root of 42768647 is about 349.7103644656.

The spelling of 42768647 in words is "forty-two million, seven hundred sixty-eight thousand, six hundred forty-seven".