643317396 has 24 divisors (see below), whose sum is σ = 1519161504. Its totient is φ = 211855200.

The previous prime is 643317373. The next prime is 643317397. The reversal of 643317396 is 693713346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643317397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321955 + ... + 323946.

It is an arithmetic number, because the mean of its divisors is an integer number (63298396).

Almost surely, 2^643317396 is an apocalyptic number.

It is an amenable number.

643317396 is an abundant number, since it is smaller than the sum of its proper divisors (875844108).

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

643317396 is a wasteful number, since it uses less digits than its factorization.

643317396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645991 (or 645989 counting only the distinct ones).

The product of its digits is 244944, while the sum is 42.

The square root of 643317396 is about 25363.7023322700. The cubic root of 643317396 is about 863.2602925971.

The spelling of 643317396 in words is "six hundred forty-three million, three hundred seventeen thousand, three hundred ninety-six".