66448789 has 4 divisors (see below), whose sum is σ = 72489600. Its totient is φ = 60407980.

The previous prime is 66448787. The next prime is 66448793. The reversal of 66448789 is 98784466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66448789 - 2¹ = 66448787 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 (66448787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3020389 + ... + 3020410.

It is an arithmetic number, because the mean of its divisors is an integer number (18122400).

Almost surely, 2^66448789 is an apocalyptic number.

It is an amenable number.

66448789 is a deficient number, since it is larger than the sum of its proper divisors (6040811).

66448789 is a wasteful number, since it uses less digits than its factorization.

66448789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6040810.

The product of its digits is 2322432, while the sum is 52.

The square root of 66448789 is about 8151.6126625349. The cubic root of 66448789 is about 405.0379256259.

The spelling of 66448789 in words is "sixty-six million, four hundred forty-eight thousand, seven hundred eighty-nine".