646045344 has 144 divisors (see below), whose sum is σ = 2191093632. Its totient is φ = 176546304.

The previous prime is 646045313. The next prime is 646045381. The reversal of 646045344 is 443540646.

646045344 is a `hidden beast` number, since 6 + 4 + 604 + 5 + 3 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 646045299 and 646045308.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 39402 + ... + 53334.

It is an arithmetic number, because the mean of its divisors is an integer number (15215928).

Almost surely, 2^646045344 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 646045344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1095546816).

646045344 is an abundant number, since it is smaller than the sum of its proper divisors (1545048288).

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

646045344 is a wasteful number, since it uses less digits than its factorization.

646045344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13979 (or 13968 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The square root of 646045344 is about 25417.4220565344. The cubic root of 646045344 is about 864.4787727121.

The spelling of 646045344 in words is "six hundred forty-six million, forty-five thousand, three hundred forty-four".