643552352 has 12 divisors (see below), whose sum is σ = 1266993756. Its totient is φ = 321776160.

The previous prime is 643552339. The next prime is 643552361. The reversal of 643552352 is 253255346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055474 + ... + 10055537.

It is an arithmetic number, because the mean of its divisors is an integer number (105582813).

Almost surely, 2^643552352 is an apocalyptic number.

It is an amenable number.

643552352 is a deficient number, since it is larger than the sum of its proper divisors (623441404).

643552352 is a wasteful number, since it uses less digits than its factorization.

643552352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20111021 (or 20111013 counting only the distinct ones).

The product of its digits is 108000, while the sum is 35.

The square root of 643552352 is about 25368.3336464972. Note that the first 3 decimals coincide. The cubic root of 643552352 is about 863.3653747328.

The spelling of 643552352 in words is "six hundred forty-three million, five hundred fifty-two thousand, three hundred fifty-two".