67642789 has 2 divisors, whose sum is σ = 67642790. Its totient is φ = 67642788.

The previous prime is 67642769. The next prime is 67642843. The reversal of 67642789 is 98724676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48650625 + 18992164 = 6975^2 + 4358^2 .

It is a cyclic number.

It is not a de Polignac number, because 67642789 - 2¹³ = 67634597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67642739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33821394 + 33821395.

It is an arithmetic number, because the mean of its divisors is an integer number (33821395).

Almost surely, 2^67642789 is an apocalyptic number.

It is an amenable number.

67642789 is a deficient number, since it is larger than the sum of its proper divisors (1).

67642789 is an equidigital number, since it uses as much as digits as its factorization.

67642789 is an odious number, because the sum of its binary digits is odd.

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

The square root of 67642789 is about 8224.5236336216. The cubic root of 67642789 is about 407.4495432276.

The spelling of 67642789 in words is "sixty-seven million, six hundred forty-two thousand, seven hundred eighty-nine".