687293109 has 12 divisors (see below), whose sum is σ = 993312736. Its totient is φ = 457938792.

The previous prime is 687293083. The next prime is 687293111. The reversal of 687293109 is 901392786.

It is not a de Polignac number, because 687293109 - 2¹¹ = 687291061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687293309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3649 + ... + 37254.

Almost surely, 2^687293109 is an apocalyptic number.

It is an amenable number.

687293109 is a deficient number, since it is larger than the sum of its proper divisors (306019627).

687293109 is a wasteful number, since it uses less digits than its factorization.

687293109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42776 (or 42773 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 687293109 is about 26216.2756508242. The cubic root of 687293109 is about 882.4985419435.

The spelling of 687293109 in words is "six hundred eighty-seven million, two hundred ninety-three thousand, one hundred nine".