67467721 has 2 divisors, whose sum is σ = 67467722. Its totient is φ = 67467720.

The previous prime is 67467707. The next prime is 67467773. The reversal of 67467721 is 12776476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52722121 + 14745600 = 7261^2 + 3840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67467721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67467791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33733860 + 33733861.

It is an arithmetic number, because the mean of its divisors is an integer number (33733861).

Almost surely, 2^67467721 is an apocalyptic number.

It is an amenable number.

67467721 is a deficient number, since it is larger than the sum of its proper divisors (1).

67467721 is an equidigital number, since it uses as much as digits as its factorization.

67467721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 40.

The square root of 67467721 is about 8213.8736902877. The cubic root of 67467721 is about 407.0977294103.

The spelling of 67467721 in words is "sixty-seven million, four hundred sixty-seven thousand, seven hundred twenty-one".