687437073 has 6 divisors (see below), whose sum is σ = 992964674. Its totient is φ = 458291376.

The previous prime is 687437071. The next prime is 687437111. The reversal of 687437073 is 370734786.

687437073 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., 571831569 + 115605504 = 23913^2 + 10752^2 .

It is not a de Polignac number, because 687437073 - 2¹ = 687437071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687437071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38190940 + ... + 38190957.

Almost surely, 2^687437073 is an apocalyptic number.

It is an amenable number.

687437073 is a deficient number, since it is larger than the sum of its proper divisors (305527601).

687437073 is a wasteful number, since it uses less digits than its factorization.

687437073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76381903 (or 76381900 counting only the distinct ones).

The product of its (nonzero) digits is 592704, while the sum is 45.

The square root of 687437073 is about 26219.0212059871. The cubic root of 687437073 is about 882.5601552245.

The spelling of 687437073 in words is "six hundred eighty-seven million, four hundred thirty-seven thousand, seventy-three".