67490309 has 2 divisors, whose sum is σ = 67490310. Its totient is φ = 67490308.

The previous prime is 67490237. The next prime is 67490327. The reversal of 67490309 is 90309476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53217025 + 14273284 = 7295^2 + 3778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67490309 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67490329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33745154 + 33745155.

It is an arithmetic number, because the mean of its divisors is an integer number (33745155).

Almost surely, 2^67490309 is an apocalyptic number.

It is an amenable number.

67490309 is a deficient number, since it is larger than the sum of its proper divisors (1).

67490309 is an equidigital number, since it uses as much as digits as its factorization.

67490309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 67490309 is about 8215.2485659291. The cubic root of 67490309 is about 407.1431560595.

The spelling of 67490309 in words is "sixty-seven million, four hundred ninety thousand, three hundred nine".