643470105 has 16 divisors (see below), whose sum is σ = 1029870720. Its totient is φ = 343077888.

The previous prime is 643470097. The next prime is 643470109. The reversal of 643470105 is 501074346.

It is not a de Polignac number, because 643470105 - 2³ = 643470097 is a prime.

It is a super-2 number, since 2×643470105² = 828107552057422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643470109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79684 + ... + 87386.

It is an arithmetic number, because the mean of its divisors is an integer number (64366920).

Almost surely, 2^643470105 is an apocalyptic number.

It is an amenable number.

643470105 is a deficient number, since it is larger than the sum of its proper divisors (386400615).

643470105 is a wasteful number, since it uses less digits than its factorization.

643470105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13280.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 643470105 is about 25366.7125382853. The cubic root of 643470105 is about 863.3285933495.

The spelling of 643470105 in words is "six hundred forty-three million, four hundred seventy thousand, one hundred five".