68427409 has 2 divisors, whose sum is σ = 68427410. Its totient is φ = 68427408.

The previous prime is 68427407. The next prime is 68427481. The reversal of 68427409 is 90472486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 199809 = 8260^2 + 447^2 .

It is a cyclic number.

It is not a de Polignac number, because 68427409 - 2¹ = 68427407 is a prime.

Together with 68427407, it forms a pair of twin primes.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (68427407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34213704 + 34213705.

It is an arithmetic number, because the mean of its divisors is an integer number (34213705).

Almost surely, 2^68427409 is an apocalyptic number.

It is an amenable number.

68427409 is a deficient number, since it is larger than the sum of its proper divisors (1).

68427409 is an equidigital number, since it uses as much as digits as its factorization.

68427409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 68427409 is about 8272.0861334974. The cubic root of 68427409 is about 409.0188894977.

The spelling of 68427409 in words is "sixty-eight million, four hundred twenty-seven thousand, four hundred nine".