643215360 has 312 divisors, whose sum is σ = 2246955120. Its totient is φ = 156893184.

The previous prime is 643215347. The next prime is 643215403. The reversal of 643215360 is 63512346.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 22179826 + ... + 22179854.

Almost surely, 2^643215360 is an apocalyptic number.

643215360 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 643215360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123477560).

643215360 is an abundant number, since it is smaller than the sum of its proper divisors (1603739760).

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

643215360 is a wasteful number, since it uses less digits than its factorization.

643215360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 643215360 is about 25361.6907953709. The cubic root of 643215360 is about 863.2146498682.

The spelling of 643215360 in words is "six hundred forty-three million, two hundred fifteen thousand, three hundred sixty".