681989734 has 16 divisors (see below), whose sum is σ = 1045170000. Its totient is φ = 333679104.

The previous prime is 681989729. The next prime is 681989741. The reversal of 681989734 is 437989186.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2484 + ... + 37015.

It is an arithmetic number, because the mean of its divisors is an integer number (65323125).

Almost surely, 2^681989734 is an apocalyptic number.

681989734 is a deficient number, since it is larger than the sum of its proper divisors (363180266).

681989734 is a wasteful number, since it uses less digits than its factorization.

681989734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39687.

The product of its digits is 2612736, while the sum is 55.

The square root of 681989734 is about 26114.9331609330. The cubic root of 681989734 is about 880.2227974100. Note that the first 3 decimals are identical.

The spelling of 681989734 in words is "six hundred eighty-one million, nine hundred eighty-nine thousand, seven hundred thirty-four".