643340135 has 8 divisors (see below), whose sum is σ = 775888800. Its totient is φ = 512085024.

The previous prime is 643340123. The next prime is 643340177. The reversal of 643340135 is 531043346.

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

It is a cyclic number.

It is not a de Polignac number, because 643340135 - 2⁴ = 643340119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643340098 and 643340107.

It is a congruent number.

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, 322292 + ... + 324281.

It is an arithmetic number, because the mean of its divisors is an integer number (96986100).

Almost surely, 2^643340135 is an apocalyptic number.

643340135 is a deficient number, since it is larger than the sum of its proper divisors (132548665).

643340135 is a wasteful number, since it uses less digits than its factorization.

643340135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646777.

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 643340135 is about 25364.1505869998. The cubic root of 643340135 is about 863.2704635457.

The spelling of 643340135 in words is "six hundred forty-three million, three hundred forty thousand, one hundred thirty-five".