681339240 has 96 divisors (see below), whose sum is σ = 2330920800. Its totient is φ = 172126080.

The previous prime is 681339229. The next prime is 681339247. The reversal of 681339240 is 42933186.

681339240 is a `hidden beast` number, since 6 + 81 + 339 + 240 = 666.

681339240 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 681339195 and 681339204.

It is not an unprimeable number, because it can be changed into a prime (681339247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42966 + ... + 56645.

It is an arithmetic number, because the mean of its divisors is an integer number (24280425).

Almost surely, 2^681339240 is an apocalyptic number.

681339240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681339240 is an abundant number, since it is smaller than the sum of its proper divisors (1649581560).

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

681339240 is a wasteful number, since it uses less digits than its factorization.

681339240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99647 (or 99640 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 681339240 is about 26102.4757446492. The cubic root of 681339240 is about 879.9428509719.

The spelling of 681339240 in words is "six hundred eighty-one million, three hundred thirty-nine thousand, two hundred forty".