681621734 has 8 divisors (see below), whose sum is σ = 1024862448. Its totient is φ = 340000920.

The previous prime is 681621727. The next prime is 681621737. The reversal of 681621734 is 437126186.

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

It is a super-2 number, since 2×681621734² = 929216376522333512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681621737) 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 3 ways as a sum of consecutive naturals, for example, 403922 + ... + 405605.

It is an arithmetic number, because the mean of its divisors is an integer number (128107806).

Almost surely, 2^681621734 is an apocalyptic number.

681621734 is a deficient number, since it is larger than the sum of its proper divisors (343240714).

681621734 is a wasteful number, since it uses less digits than its factorization.

681621734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809950.

The product of its digits is 48384, while the sum is 38.

The square root of 681621734 is about 26107.8864330302. The cubic root of 681621734 is about 880.0644468986.

It can be divided in two parts, 68162 and 1734, that added together give a palindrome (69896).

The spelling of 681621734 in words is "six hundred eighty-one million, six hundred twenty-one thousand, seven hundred thirty-four".