646403364 has 36 divisors (see below), whose sum is σ = 1634884524. Its totient is φ = 215346432.

The previous prime is 646403327. The next prime is 646403377. The reversal of 646403364 is 463304646.

646403364 is a `hidden beast` number, since 6 + 4 + 640 + 3 + 3 + 6 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 98843364 + 547560000 = 9942^2 + 23400^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

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 11 ways as a sum of consecutive naturals, for example, 78784 + ... + 86600.

It is an arithmetic number, because the mean of its divisors is an integer number (45413459).

Almost surely, 2^646403364 is an apocalyptic number.

It is an amenable number.

646403364 is an abundant number, since it is smaller than the sum of its proper divisors (988481160).

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

646403364 is a wasteful number, since it uses less digits than its factorization.

646403364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10124 (or 10119 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

The square root of 646403364 is about 25424.4638881531. The cubic root of 646403364 is about 864.6384330922.

The spelling of 646403364 in words is "six hundred forty-six million, four hundred three thousand, three hundred sixty-four".