65878489 has 2 divisors, whose sum is σ = 65878490. Its totient is φ = 65878488.

The previous prime is 65878481. The next prime is 65878493. The reversal of 65878489 is 98487856.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50410000 + 15468489 = 7100^2 + 3933^2 .

It is a cyclic number.

It is not a de Polignac number, because 65878489 - 2³ = 65878481 is a prime.

It is not a weakly prime, because it can be changed into another prime (65878481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32939244 + 32939245.

It is an arithmetic number, because the mean of its divisors is an integer number (32939245).

Almost surely, 2^65878489 is an apocalyptic number.

It is an amenable number.

65878489 is a deficient number, since it is larger than the sum of its proper divisors (1).

65878489 is an equidigital number, since it uses as much as digits as its factorization.

65878489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 55.

The square root of 65878489 is about 8116.5564742691. The cubic root of 65878489 is about 403.8758420717.

The spelling of 65878489 in words is "sixty-five million, eight hundred seventy-eight thousand, four hundred eighty-nine".