67642387 has 2 divisors, whose sum is σ = 67642388. Its totient is φ = 67642386.

The previous prime is 67642381. The next prime is 67642391. The reversal of 67642387 is 78324676.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67642387 is a prime.

It is not a weakly prime, because it can be changed into another prime (67642381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33821193 + 33821194.

It is an arithmetic number, because the mean of its divisors is an integer number (33821194).

Almost surely, 2^67642387 is an apocalyptic number.

67642387 is a deficient number, since it is larger than the sum of its proper divisors (1).

67642387 is an equidigital number, since it uses as much as digits as its factorization.

67642387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 43.

The square root of 67642387 is about 8224.4991944799. The cubic root of 67642387 is about 407.4487360707.

The spelling of 67642387 in words is "sixty-seven million, six hundred forty-two thousand, three hundred eighty-seven".