646539456 has 112 divisors (see below), whose sum is σ = 1792224000. Its totient is φ = 205427712.

The previous prime is 646539449. The next prime is 646539469. The reversal of 646539456 is 654935646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 461445 + ... + 462843.

It is an arithmetic number, because the mean of its divisors is an integer number (16002000).

Almost surely, 2^646539456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646539456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (896112000).

646539456 is an abundant number, since it is smaller than the sum of its proper divisors (1145684544).

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

646539456 is a wasteful number, since it uses less digits than its factorization.

646539456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1526 (or 1516 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 48.

The square root of 646539456 is about 25427.1401459150. The cubic root of 646539456 is about 864.6991083729.

The spelling of 646539456 in words is "six hundred forty-six million, five hundred thirty-nine thousand, four hundred fifty-six".