681817634 has 8 divisors (see below), whose sum is σ = 1024151040. Its totient is φ = 340433956.

The previous prime is 681817613. The next prime is 681817639. The reversal of 681817634 is 436718186.

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

It is not an unprimeable number, because it can be changed into a prime (681817639) 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, 235634 + ... + 238509.

It is an arithmetic number, because the mean of its divisors is an integer number (128018880).

Almost surely, 2^681817634 is an apocalyptic number.

681817634 is a deficient number, since it is larger than the sum of its proper divisors (342333406).

681817634 is a wasteful number, since it uses less digits than its factorization.

681817634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474864.

The product of its digits is 193536, while the sum is 44.

The square root of 681817634 is about 26111.6379034330. The cubic root of 681817634 is about 880.1487498204.

The spelling of 681817634 in words is "six hundred eighty-one million, eight hundred seventeen thousand, six hundred thirty-four".