681820699 has 8 divisors (see below), whose sum is σ = 784188128. Its totient is φ = 580694400.

The previous prime is 681820691. The next prime is 681820721. The reversal of 681820699 is 996028186.

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 681820699 - 2³ = 681820691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681820691) 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, 309102 + ... + 311299.

It is an arithmetic number, because the mean of its divisors is an integer number (98023516).

Almost surely, 2^681820699 is an apocalyptic number.

681820699 is a deficient number, since it is larger than the sum of its proper divisors (102367429).

681820699 is a wasteful number, since it uses less digits than its factorization.

681820699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620565.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 681820699 is about 26111.6965936723. The cubic root of 681820699 is about 880.1500686735.

The spelling of 681820699 in words is "six hundred eighty-one million, eight hundred twenty thousand, six hundred ninety-nine".