678640763 has 8 divisors (see below), whose sum is σ = 683513856. Its totient is φ = 673781800.

The previous prime is 678640757. The next prime is 678640843. The reversal of 678640763 is 367046876.

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 678640763 - 2²⁰ = 677592187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678640723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104378 + ... + 110688.

It is an arithmetic number, because the mean of its divisors is an integer number (85439232).

Almost surely, 2^678640763 is an apocalyptic number.

678640763 is a deficient number, since it is larger than the sum of its proper divisors (4873093).

678640763 is a wasteful number, since it uses less digits than its factorization.

678640763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7065.

The product of its (nonzero) digits is 1016064, while the sum is 47.

The square root of 678640763 is about 26050.7344042351. The cubic root of 678640763 is about 878.7796285505.

The spelling of 678640763 in words is "six hundred seventy-eight million, six hundred forty thousand, seven hundred sixty-three".