687963009 has 4 divisors (see below), whose sum is σ = 917284016. Its totient is φ = 458642004.

The previous prime is 687963007. The next prime is 687963049. The reversal of 687963009 is 900369786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 687963009 - 2¹ = 687963007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687963007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114660499 + ... + 114660504.

It is an arithmetic number, because the mean of its divisors is an integer number (229321004).

Almost surely, 2^687963009 is an apocalyptic number.

It is an amenable number.

687963009 is a deficient number, since it is larger than the sum of its proper divisors (229321007).

687963009 is a wasteful number, since it uses less digits than its factorization.

687963009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229321006.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 687963009 is about 26229.0489534028. The cubic root of 687963009 is about 882.7851706489.

The spelling of 687963009 in words is "six hundred eighty-seven million, nine hundred sixty-three thousand, nine".