681384384 has 168 divisors, whose sum is σ = 2146035840. Its totient is φ = 205742592.

The previous prime is 681384367. The next prime is 681384391. The reversal of 681384384 is 483483186.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250359 + ... + 253065.

Almost surely, 2^681384384 is an apocalyptic number.

681384384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681384384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073017920).

681384384 is an abundant number, since it is smaller than the sum of its proper divisors (1464651456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681384384 is a wasteful number, since it uses less digits than its factorization.

681384384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2754 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 681384384 is about 26103.3404758855. The cubic root of 681384384 is about 879.9622848850.

The spelling of 681384384 in words is "six hundred eighty-one million, three hundred eighty-four thousand, three hundred eighty-four".