67287421 has 2 divisors, whose sum is σ = 67287422. Its totient is φ = 67287420.

The previous prime is 67287401. The next prime is 67287431. The reversal of 67287421 is 12478276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45562500 + 21724921 = 6750^2 + 4661^2 .

It is a cyclic number.

It is not a de Polignac number, because 67287421 - 2⁹ = 67286909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67287401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33643710 + 33643711.

It is an arithmetic number, because the mean of its divisors is an integer number (33643711).

Almost surely, 2^67287421 is an apocalyptic number.

It is an amenable number.

67287421 is a deficient number, since it is larger than the sum of its proper divisors (1).

67287421 is an equidigital number, since it uses as much as digits as its factorization.

67287421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 37.

The square root of 67287421 is about 8202.8910147582. The cubic root of 67287421 is about 406.7347647166.

The spelling of 67287421 in words is "sixty-seven million, two hundred eighty-seven thousand, four hundred twenty-one".