643817146 has 16 divisors (see below), whose sum is σ = 1104390144. Its totient is φ = 275745744.

The previous prime is 643817117. The next prime is 643817159. The reversal of 643817146 is 641718346.

It is a junction number, because it is equal to n+sod(n) for n = 643817099 and 643817108.

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, 9456 + ... + 37108.

It is an arithmetic number, because the mean of its divisors is an integer number (69024384).

Almost surely, 2^643817146 is an apocalyptic number.

643817146 is a deficient number, since it is larger than the sum of its proper divisors (460572998).

643817146 is a wasteful number, since it uses less digits than its factorization.

643817146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29325.

The product of its digits is 96768, while the sum is 40.

The square root of 643817146 is about 25373.5520966222. The cubic root of 643817146 is about 863.4837710179.

The spelling of 643817146 in words is "six hundred forty-three million, eight hundred seventeen thousand, one hundred forty-six".