681732379 has 8 divisors (see below), whose sum is σ = 698774832. Its totient is φ = 664709760.

The previous prime is 681732367. The next prime is 681732421. The reversal of 681732379 is 973237186.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 681732379 - 2⁷ = 681732251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681732329) 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 7 ways as a sum of consecutive naturals, for example, 84412 + ... + 92134.

It is an arithmetic number, because the mean of its divisors is an integer number (87346854).

Almost surely, 2^681732379 is an apocalyptic number.

681732379 is a deficient number, since it is larger than the sum of its proper divisors (17042453).

681732379 is a wasteful number, since it uses less digits than its factorization.

681732379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9917.

The product of its digits is 381024, while the sum is 46.

The square root of 681732379 is about 26110.0053427800. The cubic root of 681732379 is about 880.1120634663.

The spelling of 681732379 in words is "six hundred eighty-one million, seven hundred thirty-two thousand, three hundred seventy-nine".