643496108 has 24 divisors (see below), whose sum is σ = 1150898112. Its totient is φ = 314705664.

The previous prime is 643496081. The next prime is 643496111. The reversal of 643496108 is 801694346.

It is a super-2 number, since 2×643496108² = 828174482022295328, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 66941 + ... + 75947.

It is an arithmetic number, because the mean of its divisors is an integer number (47954088).

Almost surely, 2^643496108 is an apocalyptic number.

It is an amenable number.

643496108 is a deficient number, since it is larger than the sum of its proper divisors (507402004).

643496108 is a wasteful number, since it uses less digits than its factorization.

643496108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401 (or 9399 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 643496108 is about 25367.2250748875. The cubic root of 643496108 is about 863.3402223958.

The spelling of 643496108 in words is "six hundred forty-three million, four hundred ninety-six thousand, one hundred eight".