643602696 has 64 divisors (see below), whose sum is σ = 1765108800. Its totient is φ = 193939200.

The previous prime is 643602683. The next prime is 643602703. The reversal of 643602696 is 696206346.

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, 41050 + ... + 54518.

It is an arithmetic number, because the mean of its divisors is an integer number (27579825).

Almost surely, 2^643602696 is an apocalyptic number.

643602696 is a gapful number since it is divisible by the number (66) 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 643602696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882554400).

643602696 is an abundant number, since it is smaller than the sum of its proper divisors (1121506104).

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

643602696 is a wasteful number, since it uses less digits than its factorization.

643602696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13670 (or 13666 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 643602696 is about 25369.3258877724. The cubic root of 643602696 is about 863.3878873447.

The spelling of 643602696 in words is "six hundred forty-three million, six hundred two thousand, six hundred ninety-six".