67401709 has 2 divisors, whose sum is σ = 67401710. Its totient is φ = 67401708.

The previous prime is 67401689. The next prime is 67401731. The reversal of 67401709 is 90710476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37393225 + 30008484 = 6115^2 + 5478^2 .

It is a cyclic number.

It is not a de Polignac number, because 67401709 - 2¹⁵ = 67368941 is a prime.

It is a super-2 number, since 2×67401709² = 9085980752241362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67401749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33700854 + 33700855.

It is an arithmetic number, because the mean of its divisors is an integer number (33700855).

Almost surely, 2^67401709 is an apocalyptic number.

It is an amenable number.

67401709 is a deficient number, since it is larger than the sum of its proper divisors (1).

67401709 is an equidigital number, since it uses as much as digits as its factorization.

67401709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 67401709 is about 8209.8543836051. The cubic root of 67401709 is about 406.9649147636.

The spelling of 67401709 in words is "sixty-seven million, four hundred one thousand, seven hundred nine".