646608789 has 12 divisors (see below), whose sum is σ = 949821600. Its totient is φ = 423765864.

The previous prime is 646608773. The next prime is 646608829. The reversal of 646608789 is 987806646.

It is not a de Polignac number, because 646608789 - 2⁴ = 646608773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646608749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 608329 + ... + 609390.

It is an arithmetic number, because the mean of its divisors is an integer number (79151800).

Almost surely, 2^646608789 is an apocalyptic number.

It is an amenable number.

646608789 is a deficient number, since it is larger than the sum of its proper divisors (303212811).

646608789 is a wasteful number, since it uses less digits than its factorization.

646608789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217784 (or 1217781 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 646608789 is about 25428.5034754309. The cubic root of 646608789 is about 864.7300165357.

The spelling of 646608789 in words is "six hundred forty-six million, six hundred eight thousand, seven hundred eighty-nine".