67630621 has 2 divisors, whose sum is σ = 67630622. Its totient is φ = 67630620.

The previous prime is 67630609. The next prime is 67630627. The reversal of 67630621 is 12603676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66748900 + 881721 = 8170^2 + 939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67630621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67630627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33815310 + 33815311.

It is an arithmetic number, because the mean of its divisors is an integer number (33815311).

Almost surely, 2^67630621 is an apocalyptic number.

It is an amenable number.

67630621 is a deficient number, since it is larger than the sum of its proper divisors (1).

67630621 is an equidigital number, since it uses as much as digits as its factorization.

67630621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 67630621 is about 8223.7838614594. The cubic root of 67630621 is about 407.4251102544.

The spelling of 67630621 in words is "sixty-seven million, six hundred thirty thousand, six hundred twenty-one".