66448589 has 8 divisors (see below), whose sum is σ = 67376568. Its totient is φ = 65525760.

The previous prime is 66448579. The next prime is 66448601. The reversal of 66448589 is 98584466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1646089 + 64802500 = 1283^2 + 8050^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66448589 - 2²⁴ = 49671373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66448579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29669 + ... + 31829.

It is an arithmetic number, because the mean of its divisors is an integer number (8422071).

Almost surely, 2^66448589 is an apocalyptic number.

It is an amenable number.

66448589 is a deficient number, since it is larger than the sum of its proper divisors (927979).

66448589 is a wasteful number, since it uses less digits than its factorization.

66448589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575.

The product of its digits is 1658880, while the sum is 50.

The square root of 66448589 is about 8151.6003950145. The cubic root of 66448589 is about 405.0375192595.

The spelling of 66448589 in words is "sixty-six million, four hundred forty-eight thousand, five hundred eighty-nine".