67388641 has 2 divisors, whose sum is σ = 67388642. Its totient is φ = 67388640.

The previous prime is 67388623. The next prime is 67388669. The reversal of 67388641 is 14688376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38390416 + 28998225 = 6196^2 + 5385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67388641 is a prime.

It is not a weakly prime, because it can be changed into another prime (67382641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33694320 + 33694321.

It is an arithmetic number, because the mean of its divisors is an integer number (33694321).

Almost surely, 2^67388641 is an apocalyptic number.

It is an amenable number.

67388641 is a deficient number, since it is larger than the sum of its proper divisors (1).

67388641 is an equidigital number, since it uses as much as digits as its factorization.

67388641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 67388641 is about 8209.0584722001. The cubic root of 67388641 is about 406.9386119625.

The spelling of 67388641 in words is "sixty-seven million, three hundred eighty-eight thousand, six hundred forty-one".