687068944 has 15 divisors (see below), whose sum is σ = 1331399253. Its totient is φ = 343482048.

The previous prime is 687068911. The next prime is 687068951. The reversal of 687068944 is 449860786.

It is a happy number.

The square root of 687068944 is 26212.

It is a perfect power (a square), and thus also a powerful number.

687068944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 232867600 + 454201344 = 15260^2 + 21312^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687068891 and 687068900.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 101572 + ... + 108124.

Almost surely, 2^687068944 is an apocalyptic number.

687068944 is the 26212-nd square number.

It is an amenable number.

687068944 is a deficient number, since it is larger than the sum of its proper divisors (644330309).

687068944 is an frugal number, since it uses more digits than its factorization.

687068944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13114 (or 6555 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The cubic root of 687068944 is about 882.4025873479.

The spelling of 687068944 in words is "six hundred eighty-seven million, sixty-eight thousand, nine hundred forty-four".