643406001 has 8 divisors (see below), whose sum is σ = 980428224. Its totient is φ = 367660560.

The previous prime is 643405999. The next prime is 643406041. The reversal of 643406001 is 100604346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643406001 - 2¹ = 643405999 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643406041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15319170 + ... + 15319211.

It is an arithmetic number, because the mean of its divisors is an integer number (122553528).

Almost surely, 2^643406001 is an apocalyptic number.

It is an amenable number.

643406001 is a deficient number, since it is larger than the sum of its proper divisors (337022223).

643406001 is a wasteful number, since it uses less digits than its factorization.

643406001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30638391.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 643406001 is about 25365.4489611361. The cubic root of 643406001 is about 863.2999234581.

The spelling of 643406001 in words is "six hundred forty-three million, four hundred six thousand, one".