67990309 has 2 divisors, whose sum is σ = 67990310. Its totient is φ = 67990308.

The previous prime is 67990249. The next prime is 67990313. The reversal of 67990309 is 90309976.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60684100 + 7306209 = 7790^2 + 2703^2 .

It is a cyclic number.

It is not a de Polignac number, because 67990309 - 2¹⁷ = 67859237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67996309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33995154 + 33995155.

It is an arithmetic number, because the mean of its divisors is an integer number (33995155).

Almost surely, 2^67990309 is an apocalyptic number.

It is an amenable number.

67990309 is a deficient number, since it is larger than the sum of its proper divisors (1).

67990309 is an equidigital number, since it uses as much as digits as its factorization.

67990309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 67990309 is about 8245.6236271127. The cubic root of 67990309 is about 408.1461194080.

The spelling of 67990309 in words is "sixty-seven million, nine hundred ninety thousand, three hundred nine".