42668287 has 2 divisors, whose sum is σ = 42668288. Its totient is φ = 42668286.

The previous prime is 42668279. The next prime is 42668293. The reversal of 42668287 is 78286624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42668287 - 2³ = 42668279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42668207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21334143 + 21334144.

It is an arithmetic number, because the mean of its divisors is an integer number (21334144).

Almost surely, 2^42668287 is an apocalyptic number.

42668287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42668287 is an equidigital number, since it uses as much as digits as its factorization.

42668287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 43.

The square root of 42668287 is about 6532.0966771780. The cubic root of 42668287 is about 349.4366092496.

The spelling of 42668287 in words is "forty-two million, six hundred sixty-eight thousand, two hundred eighty-seven".