67649539 has 2 divisors, whose sum is σ = 67649540. Its totient is φ = 67649538.

The previous prime is 67649537. The next prime is 67649551. The reversal of 67649539 is 93594676.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67649539 - 2¹ = 67649537 is a prime.

Together with 67649537, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 67649492 and 67649501.

It is not a weakly prime, because it can be changed into another prime (67649537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33824769 + 33824770.

It is an arithmetic number, because the mean of its divisors is an integer number (33824770).

Almost surely, 2^67649539 is an apocalyptic number.

67649539 is a deficient number, since it is larger than the sum of its proper divisors (1).

67649539 is an equidigital number, since it uses as much as digits as its factorization.

67649539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 67649539 is about 8224.9339814980. The cubic root of 67649539 is about 407.4630957584.

The spelling of 67649539 in words is "sixty-seven million, six hundred forty-nine thousand, five hundred thirty-nine".