643714968 has 64 divisors (see below), whose sum is σ = 1757548800. Its totient is φ = 195269760.

The previous prime is 643714931. The next prime is 643714987. The reversal of 643714968 is 869417346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7623 + ... + 36681.

It is an arithmetic number, because the mean of its divisors is an integer number (27461700).

Almost surely, 2^643714968 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 643714968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (878774400).

643714968 is an abundant number, since it is smaller than the sum of its proper divisors (1113833832).

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

643714968 is a wasteful number, since it uses less digits than its factorization.

643714968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29152 (or 29148 counting only the distinct ones).

The product of its digits is 870912, while the sum is 48.

The square root of 643714968 is about 25371.5385422327. The cubic root of 643714968 is about 863.4380884235.

The spelling of 643714968 in words is "six hundred forty-three million, seven hundred fourteen thousand, nine hundred sixty-eight".