646354944 has 96 divisors (see below), whose sum is σ = 1914822000. Its totient is φ = 215433216.

The previous prime is 646354937. The next prime is 646354967. The reversal of 646354944 is 449453646.

646354944 is a `hidden beast` number, since 6 + 4 + 63 + 549 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 646354944.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49452 + ... + 61140.

Almost surely, 2^646354944 is an apocalyptic number.

646354944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646354944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (957411000).

646354944 is an abundant number, since it is smaller than the sum of its proper divisors (1268467056).

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

646354944 is a wasteful number, since it uses less digits than its factorization.

646354944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11720 (or 11694 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The square root of 646354944 is about 25423.5116378521. The cubic root of 646354944 is about 864.6168434571.

The spelling of 646354944 in words is "six hundred forty-six million, three hundred fifty-four thousand, nine hundred forty-four".