67491647 has 2 divisors, whose sum is σ = 67491648. Its totient is φ = 67491646.

The previous prime is 67491607. The next prime is 67491659. The reversal of 67491647 is 74619476.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67491647 - 2¹⁰ = 67490623 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 67491598 and 67491607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67491607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33745823 + 33745824.

It is an arithmetic number, because the mean of its divisors is an integer number (33745824).

Almost surely, 2^67491647 is an apocalyptic number.

67491647 is a deficient number, since it is larger than the sum of its proper divisors (1).

67491647 is an equidigital number, since it uses as much as digits as its factorization.

67491647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 44.

The square root of 67491647 is about 8215.3299994583. The cubic root of 67491647 is about 407.1458465887.

The spelling of 67491647 in words is "sixty-seven million, four hundred ninety-one thousand, six hundred forty-seven".