684508478 has 8 divisors (see below), whose sum is σ = 1080802920. Its totient is φ = 324240840.

The previous prime is 684508471. The next prime is 684508481. The reversal of 684508478 is 874805486.

684508478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684508471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9006653 + ... + 9006728.

It is an arithmetic number, because the mean of its divisors is an integer number (135100365).

Almost surely, 2^684508478 is an apocalyptic number.

684508478 is a deficient number, since it is larger than the sum of its proper divisors (396294442).

684508478 is a wasteful number, since it uses less digits than its factorization.

684508478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18013402.

The product of its (nonzero) digits is 1720320, while the sum is 50.

The square root of 684508478 is about 26163.1129264084. The cubic root of 684508478 is about 881.3050874606.

The spelling of 684508478 in words is "six hundred eighty-four million, five hundred eight thousand, four hundred seventy-eight".