684048681 has 24 divisors (see below), whose sum is σ = 1032295680. Its totient is φ = 435669696.

The previous prime is 684048671. The next prime is 684048689. The reversal of 684048681 is 186840486.

It is a de Polignac number, because none of the positive numbers 2^k-684048681 is a prime.

It is a super-2 number, since 2×684048681² = 935845195955679522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (684048689) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 232240 + ... + 235166.

It is an arithmetic number, because the mean of its divisors is an integer number (43012320).

Almost surely, 2^684048681 is an apocalyptic number.

It is an amenable number.

684048681 is a deficient number, since it is larger than the sum of its proper divisors (348246999).

684048681 is a wasteful number, since it uses less digits than its factorization.

684048681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4085 (or 4082 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 684048681 is about 26154.3243269636. The cubic root of 684048681 is about 881.1077136204.

The spelling of 684048681 in words is "six hundred eighty-four million, forty-eight thousand, six hundred eighty-one".