646395460 has 12 divisors (see below), whose sum is σ = 1357430508. Its totient is φ = 258558176.

The previous prime is 646395419. The next prime is 646395469. The reversal of 646395460 is 64593646.

It can be written as a sum of positive squares in 2 ways, for example, as 490445316 + 155950144 = 22146^2 + 12488^2 .

It is a super-2 number, since 2×646395460² = 835654181417223200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646395469) 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 3 ways as a sum of consecutive naturals, for example, 16159867 + ... + 16159906.

It is an arithmetic number, because the mean of its divisors is an integer number (113119209).

Almost surely, 2^646395460 is an apocalyptic number.

It is an amenable number.

646395460 is an abundant number, since it is smaller than the sum of its proper divisors (711035048).

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

646395460 is a wasteful number, since it uses less digits than its factorization.

646395460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32319782 (or 32319780 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 43.

The square root of 646395460 is about 25424.3084468388. The cubic root of 646395460 is about 864.6349089098.

The spelling of 646395460 in words is "six hundred forty-six million, three hundred ninety-five thousand, four hundred sixty".