643078795 has 4 divisors (see below), whose sum is σ = 771694560. Its totient is φ = 514463032.

The previous prime is 643078783. The next prime is 643078811. The reversal of 643078795 is 597870346.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643078795 - 2⁹ = 643078283 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64307875 + ... + 64307884.

It is an arithmetic number, because the mean of its divisors is an integer number (192923640).

Almost surely, 2^643078795 is an apocalyptic number.

643078795 is a deficient number, since it is larger than the sum of its proper divisors (128615765).

643078795 is a wasteful number, since it uses less digits than its factorization.

643078795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128615764.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The square root of 643078795 is about 25358.9983043495. The cubic root of 643078795 is about 863.1535540777.

The spelling of 643078795 in words is "six hundred forty-three million, seventy-eight thousand, seven hundred ninety-five".