684330891 has 8 divisors (see below), whose sum is σ = 952112640. Its totient is φ = 436384872.

The previous prime is 684330883. The next prime is 684330901. The reversal of 684330891 is 198033486.

It is a happy number.

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

It is not a de Polignac number, because 684330891 - 2³ = 684330883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684330811) 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, 4958851 + ... + 4958988.

It is an arithmetic number, because the mean of its divisors is an integer number (119014080).

Almost surely, 2^684330891 is an apocalyptic number.

684330891 is a deficient number, since it is larger than the sum of its proper divisors (267781749).

684330891 is a wasteful number, since it uses less digits than its factorization.

684330891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9917865.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 684330891 is about 26159.7188631682. The cubic root of 684330891 is about 881.2288664114.

The spelling of 684330891 in words is "six hundred eighty-four million, three hundred thirty thousand, eight hundred ninety-one".