643153068 has 144 divisors (see below), whose sum is σ = 1768617760. Its totient is φ = 202051584.

The previous prime is 643153067. The next prime is 643153079. The reversal of 643153068 is 860351346.

643153068 is a `hidden beast` number, since 64 + 3 + 1 + 530 + 68 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (643153067) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6630396 + ... + 6630492.

Almost surely, 2^643153068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643153068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884308880).

643153068 is an abundant number, since it is smaller than the sum of its proper divisors (1125464692).

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

643153068 is a wasteful number, since it uses less digits than its factorization.

643153068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 643153068 is about 25360.4626929400. The cubic root of 643153068 is about 863.1867830467.

The spelling of 643153068 in words is "six hundred forty-three million, one hundred fifty-three thousand, sixty-eight".