643582196 has 24 divisors (see below), whose sum is σ = 1174607616. Its totient is φ = 308194560.

The previous prime is 643582183. The next prime is 643582241. The reversal of 643582196 is 691285346.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14726 + ... + 38781.

It is an arithmetic number, because the mean of its divisors is an integer number (48941984).

Almost surely, 2^643582196 is an apocalyptic number.

It is an amenable number.

643582196 is a deficient number, since it is larger than the sum of its proper divisors (531025420).

643582196 is a wasteful number, since it uses less digits than its factorization.

643582196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53639 (or 53637 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 643582196 is about 25368.9218533228. The cubic root of 643582196 is about 863.3787203852.

The spelling of 643582196 in words is "six hundred forty-three million, five hundred eighty-two thousand, one hundred ninety-six".