67218641 has 12 divisors (see below), whose sum is σ = 79521840. Its totient is φ = 56637000.

The previous prime is 67218587. The next prime is 67218643. The reversal of 67218641 is 14681276.

It is a de Polignac number, because none of the positive numbers 2^k-67218641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67218643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8735 + ... + 14516.

It is an arithmetic number, because the mean of its divisors is an integer number (6626820).

Almost surely, 2^67218641 is an apocalyptic number.

It is an amenable number.

67218641 is a deficient number, since it is larger than the sum of its proper divisors (12303199).

67218641 is a wasteful number, since it uses less digits than its factorization.

67218641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23324 (or 23317 counting only the distinct ones).

The product of its digits is 16128, while the sum is 35.

The square root of 67218641 is about 8198.6975185087. The cubic root of 67218641 is about 406.5961317991.

The spelling of 67218641 in words is "sixty-seven million, two hundred eighteen thousand, six hundred forty-one".