643284360 has 96 divisors (see below), whose sum is σ = 2117232000. Its totient is φ = 169363584.

The previous prime is 643284359. The next prime is 643284407. The reversal of 643284360 is 63482346.

It is a happy number.

643284360 is a `hidden beast` number, since 643 + 2 + 8 + 4 + 3 + 6 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17131 + ... + 39749.

It is an arithmetic number, because the mean of its divisors is an integer number (22054500).

Almost surely, 2^643284360 is an apocalyptic number.

643284360 is a gapful number since it is divisible by the number (60) 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 643284360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058616000).

643284360 is an abundant number, since it is smaller than the sum of its proper divisors (1473947640).

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

643284360 is a wasteful number, since it uses less digits than its factorization.

643284360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22715 (or 22708 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 643284360 is about 25363.0510782910. The cubic root of 643284360 is about 863.2455154667.

The spelling of 643284360 in words is "six hundred forty-three million, two hundred eighty-four thousand, three hundred sixty".