687573650 has 24 divisors (see below), whose sum is σ = 1287047460. Its totient is φ = 273274560.

The previous prime is 687573643. The next prime is 687573697. The reversal of 687573650 is 56375786.

It is a happy number.

687573650 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 6 ways, for example, as 113060689 + 574512961 = 10633^2 + 23969^2 .

It is a junction number, because it is equal to n+sod(n) for n = 687573595 and 687573604.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35945 + ... + 51644.

Almost surely, 2^687573650 is an apocalyptic number.

687573650 is a deficient number, since it is larger than the sum of its proper divisors (599473810).

687573650 is a wasteful number, since it uses less digits than its factorization.

687573650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87758 (or 87753 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 47.

The square root of 687573650 is about 26221.6256170360. The cubic root of 687573650 is about 882.6185990886.

It can be divided in two parts, 6875736 and 50, that added together give a palindrome (6875786).

The spelling of 687573650 in words is "six hundred eighty-seven million, five hundred seventy-three thousand, six hundred fifty".