6618789 has 6 divisors (see below), whose sum is σ = 9560486. Its totient is φ = 4412520.

The previous prime is 6618769. The next prime is 6618809. The reversal of 6618789 is 9878166.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6618769) and next prime (6618809).

It can be written as a sum of positive squares in only one way, i.e., 4588164 + 2030625 = 2142^2 + 1425^2 .

It is not a de Polignac number, because 6618789 - 2⁸ = 6618533 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 (6618739) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 367702 + ... + 367719.

Almost surely, 2^6618789 is an apocalyptic number.

It is an amenable number.

6618789 is a deficient number, since it is larger than the sum of its proper divisors (2941697).

6618789 is a wasteful number, since it uses less digits than its factorization.

6618789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735427 (or 735424 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 6618789 is about 2572.7007210323. The cubic root of 6618789 is about 187.7555768044.

The spelling of 6618789 in words is "six million, six hundred eighteen thousand, seven hundred eighty-nine".