646539048 has 24 divisors (see below), whose sum is σ = 1751043450. Its totient is φ = 215512992.

The previous prime is 646539043. The next prime is 646539067. The reversal of 646539048 is 840935646.

It can be written as a sum of positive squares in only one way, i.e., 623900484 + 22638564 = 24978^2 + 4758^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 646538994 and 646539012.

It is not an unprimeable number, because it can be changed into a prime (646539043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4489783 + ... + 4489926.

Almost surely, 2^646539048 is an apocalyptic number.

It is an amenable number.

646539048 is an abundant number, since it is smaller than the sum of its proper divisors (1104504402).

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

646539048 is a wasteful number, since it uses less digits than its factorization.

646539048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8979721 (or 8979714 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 646539048 is about 25427.1321229902. The cubic root of 646539048 is about 864.6989264828.

The spelling of 646539048 in words is "six hundred forty-six million, five hundred thirty-nine thousand, forty-eight".