643316364 has 48 divisors (see below), whose sum is σ = 1755644800. Its totient is φ = 203151888.

The previous prime is 643316347. The next prime is 643316381. The reversal of 643316364 is 463613346.

643316364 is a `hidden beast` number, since 6 + 433 + 163 + 64 = 666.

It is an interprime number because it is at equal distance from previous prime (643316347) and next prime (643316381).

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

It is a nude number because it is divisible by every one of its digits.

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 15 ways as a sum of consecutive naturals, for example, 154702 + ... + 158805.

Almost surely, 2^643316364 is an apocalyptic number.

It is an amenable number.

643316364 is an abundant number, since it is smaller than the sum of its proper divisors (1112328436).

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

643316364 is a wasteful number, since it uses less digits than its factorization.

643316364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313539 (or 313531 counting only the distinct ones).

The product of its digits is 93312, while the sum is 36.

The square root of 643316364 is about 25363.6819882288. The cubic root of 643316364 is about 863.2598309872.

The spelling of 643316364 in words is "six hundred forty-three million, three hundred sixteen thousand, three hundred sixty-four".