643168080 has 160 divisors (see below), whose sum is σ = 2233249920. Its totient is φ = 170127360.

The previous prime is 643167997. The next prime is 643168081. The reversal of 643168080 is 80861346.

It is a happy number.

643168080 is a `hidden beast` number, since 643 + 1 + 6 + 8 + 0 + 8 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643168081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 281824 + ... + 284096.

It is an arithmetic number, because the mean of its divisors is an integer number (13957812).

Almost surely, 2^643168080 is an apocalyptic number.

643168080 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 643168080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1116624960).

643168080 is an abundant number, since it is smaller than the sum of its proper divisors (1590081840).

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

643168080 is a wasteful number, since it uses less digits than its factorization.

643168080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2426 (or 2414 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 643168080 is about 25360.7586637309. The cubic root of 643168080 is about 863.1934989488.

The spelling of 643168080 in words is "six hundred forty-three million, one hundred sixty-eight thousand, eighty".