67420609 has 4 divisors (see below), whose sum is σ = 67683204. Its totient is φ = 67158016.

The previous prime is 67420571. The next prime is 67420627. The reversal of 67420609 is 90602476.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56550400 + 10870209 = 7520^2 + 3297^2 .

It is a cyclic number.

It is not a de Polignac number, because 67420609 - 2⁷ = 67420481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67420649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130912 + ... + 131425.

It is an arithmetic number, because the mean of its divisors is an integer number (16920801).

Almost surely, 2^67420609 is an apocalyptic number.

It is an amenable number.

67420609 is a deficient number, since it is larger than the sum of its proper divisors (262595).

67420609 is a wasteful number, since it uses less digits than its factorization.

67420609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262594.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 67420609 is about 8211.0053586635. The cubic root of 67420609 is about 407.0029499914.

The spelling of 67420609 in words is "sixty-seven million, four hundred twenty thousand, six hundred nine".