681599842 has 32 divisors (see below), whose sum is σ = 1277829504. Its totient is φ = 264902400.

The previous prime is 681599839. The next prime is 681599851. The reversal of 681599842 is 248995186.

It is a super-2 number, since 2×681599842² = 929156689228849928, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681599842.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59578 + ... + 70090.

It is an arithmetic number, because the mean of its divisors is an integer number (39932172).

Almost surely, 2^681599842 is an apocalyptic number.

681599842 is a deficient number, since it is larger than the sum of its proper divisors (596229662).

681599842 is a wasteful number, since it uses less digits than its factorization.

681599842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10954.

The product of its digits is 1244160, while the sum is 52.

The square root of 681599842 is about 26107.4671693751. The cubic root of 681599842 is about 880.0550249684.

The spelling of 681599842 in words is "six hundred eighty-one million, five hundred ninety-nine thousand, eight hundred forty-two".