643402107 has 6 divisors (see below), whose sum is σ = 929358612. Its totient is φ = 428934732.

The previous prime is 643402099. The next prime is 643402121. The reversal of 643402107 is 701204346.

643402107 is a `hidden beast` number, since 643 + 4 + 0 + 2 + 10 + 7 = 666.

It is not a de Polignac number, because 643402107 - 2³ = 643402099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643402127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35744553 + ... + 35744570.

It is an arithmetic number, because the mean of its divisors is an integer number (154893102).

Almost surely, 2^643402107 is an apocalyptic number.

643402107 is a deficient number, since it is larger than the sum of its proper divisors (285956505).

643402107 is a wasteful number, since it uses less digits than its factorization.

643402107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71489129 (or 71489126 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 643402107 is about 25365.3722030646. The cubic root of 643402107 is about 863.2981818431.

The spelling of 643402107 in words is "six hundred forty-three million, four hundred two thousand, one hundred seven".