680723444 has 6 divisors (see below), whose sum is σ = 1191266034. Its totient is φ = 340361720.

The previous prime is 680723441. The next prime is 680723471. The reversal of 680723444 is 444327086.

It can be written as a sum of positive squares in only one way, i.e., 680688100 + 35344 = 26090^2 + 188^2 .

It is a super-2 number, since 2×680723444² = 926768814422442272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 680723398 and 680723407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680723441) 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 as a sum of consecutive naturals, namely, 85090427 + ... + 85090434.

It is an arithmetic number, because the mean of its divisors is an integer number (198544339).

Almost surely, 2^680723444 is an apocalyptic number.

It is an amenable number.

680723444 is a deficient number, since it is larger than the sum of its proper divisors (510542590).

680723444 is a wasteful number, since it uses less digits than its factorization.

680723444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170180865 (or 170180863 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 38.

The square root of 680723444 is about 26090.6773388504. The cubic root of 680723444 is about 879.6776729302.

The spelling of 680723444 in words is "six hundred eighty million, seven hundred twenty-three thousand, four hundred forty-four".