67989557 has 2 divisors, whose sum is σ = 67989558. Its totient is φ = 67989556.

The previous prime is 67989553. The next prime is 67989599. The reversal of 67989557 is 75598976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50608996 + 17380561 = 7114^2 + 4169^2 .

It is a cyclic number.

It is not a de Polignac number, because 67989557 - 2² = 67989553 is a prime.

It is a super-2 number, since 2×67989557² = 9245159722112498, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67989553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33994778 + 33994779.

It is an arithmetic number, because the mean of its divisors is an integer number (33994779).

Almost surely, 2^67989557 is an apocalyptic number.

It is an amenable number.

67989557 is a deficient number, since it is larger than the sum of its proper divisors (1).

67989557 is an equidigital number, since it uses as much as digits as its factorization.

67989557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4762800, while the sum is 56.

The square root of 67989557 is about 8245.5780270397. The cubic root of 67989557 is about 408.1446146494.

The spelling of 67989557 in words is "sixty-seven million, nine hundred eighty-nine thousand, five hundred fifty-seven".