646789480 has 32 divisors (see below), whose sum is σ = 1540882440. Its totient is φ = 243496960.

The previous prime is 646789459. The next prime is 646789519. The reversal of 646789480 is 84987646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 626701156 + 20088324 = 25034^2 + 4482^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474901 + ... + 476260.

Almost surely, 2^646789480 is an apocalyptic number.

It is an amenable number.

646789480 is an abundant number, since it is smaller than the sum of its proper divisors (894092960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646789480 is a wasteful number, since it uses less digits than its factorization.

646789480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951189 (or 951185 counting only the distinct ones).

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

The square root of 646789480 is about 25432.0561496706. The cubic root of 646789480 is about 864.8105569295.

The spelling of 646789480 in words is "six hundred forty-six million, seven hundred eighty-nine thousand, four hundred eighty".