67635989 has 2 divisors, whose sum is σ = 67635990. Its totient is φ = 67635988.

The previous prime is 67635983. The next prime is 67636001. The reversal of 67635989 is 98953676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48539089 + 19096900 = 6967^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 67635989 - 2¹⁶ = 67570453 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67635989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67635983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33817994 + 33817995.

It is an arithmetic number, because the mean of its divisors is an integer number (33817995).

Almost surely, 2^67635989 is an apocalyptic number.

It is an amenable number.

67635989 is a deficient number, since it is larger than the sum of its proper divisors (1).

67635989 is an equidigital number, since it uses as much as digits as its factorization.

67635989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 53.

The square root of 67635989 is about 8224.1102254286. The cubic root of 67635989 is about 407.4358893961.

It can be divided in two parts, 67 and 635989, that added together give a cube (636056 = 86³).

The spelling of 67635989 in words is "sixty-seven million, six hundred thirty-five thousand, nine hundred eighty-nine".