67428643 has 2 divisors, whose sum is σ = 67428644. Its totient is φ = 67428642.

The previous prime is 67428611. The next prime is 67428661. The reversal of 67428643 is 34682476.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67428643 - 2⁵ = 67428611 is a prime.

It is equal to p_3975592 and since 67428643 and 3975592 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 67428596 and 67428605.

It is not a weakly prime, because it can be changed into another prime (67428043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33714321 + 33714322.

It is an arithmetic number, because the mean of its divisors is an integer number (33714322).

Almost surely, 2^67428643 is an apocalyptic number.

67428643 is a deficient number, since it is larger than the sum of its proper divisors (1).

67428643 is an equidigital number, since it uses as much as digits as its factorization.

67428643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 40.

The square root of 67428643 is about 8211.4945655465. The cubic root of 67428643 is about 407.0191158289.

The spelling of 67428643 in words is "sixty-seven million, four hundred twenty-eight thousand, six hundred forty-three".