681650804 has 12 divisors (see below), whose sum is σ = 1203446244. Its totient is φ = 337809024.

The previous prime is 681650791. The next prime is 681650813. The reversal of 681650804 is 408056186.

It can be written as a sum of positive squares in 2 ways, for example, as 8352100 + 673298704 = 2890^2 + 25948^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753587 + ... + 754490.

It is an arithmetic number, because the mean of its divisors is an integer number (100287187).

Almost surely, 2^681650804 is an apocalyptic number.

It is an amenable number.

681650804 is a deficient number, since it is larger than the sum of its proper divisors (521795440).

681650804 is a wasteful number, since it uses less digits than its factorization.

681650804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508194 (or 1508192 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 681650804 is about 26108.4431554239. The cubic root of 681650804 is about 880.0769578014.

The spelling of 681650804 in words is "six hundred eighty-one million, six hundred fifty thousand, eight hundred four".