646448544 has 72 divisors (see below), whose sum is σ = 2100964320. Its totient is φ = 184699008.

The previous prime is 646448513. The next prime is 646448573. The reversal of 646448544 is 445844646.

646448544 is a `hidden beast` number, since 6 + 4 + 64 + 48 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 646448544.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158314 + ... + 162345.

It is an arithmetic number, because the mean of its divisors is an integer number (29180060).

Almost surely, 2^646448544 is an apocalyptic number.

It is an amenable number.

646448544 is an abundant number, since it is smaller than the sum of its proper divisors (1454515776).

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

646448544 is a wasteful number, since it uses less digits than its factorization.

646448544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320682 (or 320671 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 45.

The square root of 646448544 is about 25425.3523869385. The cubic root of 646448544 is about 864.6585770954.

The spelling of 646448544 in words is "six hundred forty-six million, four hundred forty-eight thousand, five hundred forty-four".