42668779 has 4 divisors (see below), whose sum is σ = 42723784. Its totient is φ = 42613776.

The previous prime is 42668761. The next prime is 42668783. The reversal of 42668779 is 97786624.

42668779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42668779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42668729) 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, 26322 + ... + 27895.

It is an arithmetic number, because the mean of its divisors is an integer number (10680946).

Almost surely, 2^42668779 is an apocalyptic number.

42668779 is a deficient number, since it is larger than the sum of its proper divisors (55005).

42668779 is an equidigital number, since it uses as much as digits as its factorization.

42668779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55004.

The product of its digits is 1016064, while the sum is 49.

The square root of 42668779 is about 6532.1343372591. The cubic root of 42668779 is about 349.4379523404.

The spelling of 42668779 in words is "forty-two million, six hundred sixty-eight thousand, seven hundred seventy-nine".