7664389 has 4 divisors (see below), whose sum is σ = 7686700. Its totient is φ = 7642080.

The previous prime is 7664369. The next prime is 7664407. The reversal of 7664389 is 9834667.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9834667 = 139 ⋅70753.

It can be written as a sum of positive squares in 2 ways, for example, as 5841889 + 1822500 = 2417^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 7664389 - 2⁵ = 7664357 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 (7664309) 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, 10632 + ... + 11329.

It is an arithmetic number, because the mean of its divisors is an integer number (1921675).

Almost surely, 2^7664389 is an apocalyptic number.

It is an amenable number.

7664389 is a deficient number, since it is larger than the sum of its proper divisors (22311).

7664389 is a wasteful number, since it uses less digits than its factorization.

7664389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22310.

The product of its digits is 217728, while the sum is 43.

The square root of 7664389 is about 2768.4632921532. The cubic root of 7664389 is about 197.1631945843.

The spelling of 7664389 in words is "seven million, six hundred sixty-four thousand, three hundred eighty-nine".